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Threw in a problem type with negatives, and probably most importantly made the spacing of the answers uniform. If you try the exercise off the site, you'll notice that the answer choice that is ever so slightly aligned to the left of the others is always the correct one. Quick way to rack up points!\r\n\r\nI still need to introduce the new problem type where the user populates a table of values, so this pull request probably only applies to the \"add number variety\" card on trello.\r\n\r\nEdit: Added fill-table problem type.","mergeable":null,"commits":3,"id":497167,"number":6397,"base":{"repo":{"created_at":"2011-05-09T15:40:15Z","pushed_at":"2011-11-22T16:43:29Z","private":false,"updated_at":"2011-11-22T16:43:29Z","clone_url":"https://github.com/Khan/khan-exercises.git","name":"khan-exercises","master_branch":null,"watchers":546,"svn_url":"https://svn.github.com/Khan/khan-exercises","forks":227,"language":"JavaScript","owner":{"gravatar_id":"e161651cf158cc3a0c316dff318be982","id":15455,"url":"https://api.github.com/users/Khan","login":"Khan","avatar_url":"https://secure.gravatar.com/avatar/e161651cf158cc3a0c316dff318be982?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-orgs.png"},"id":1723225,"homepage":"http://khanacademy.org/","git_url":"git://github.com/Khan/khan-exercises.git","description":"A  framework for building exercises to work with Khan Academy.","html_url":"https://github.com/Khan/khan-exercises","url":"https://api.github.com/repos/Khan/khan-exercises","size":2804,"fork":false,"ssh_url":"git@github.com:Khan/khan-exercises.git","open_issues":1155},"user":{"gravatar_id":"e161651cf158cc3a0c316dff318be982","id":15455,"url":"https://api.github.com/users/Khan","login":"Khan","avatar_url":"https://secure.gravatar.com/avatar/e161651cf158cc3a0c316dff318be982?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-orgs.png"},"sha":"67037a196910ca0f4c461094a83eb6e761fd7218","ref":"master","label":"Khan:master"},"additions":145,"merged_by":{"gravatar_id":"91e2e1c5cda628431f62bdaa980b8cd6","id":1017630,"url":"https://api.github.com/users/beneater","login":"beneater","avatar_url":"https://secure.gravatar.com/avatar/91e2e1c5cda628431f62bdaa980b8cd6?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png"},"head":{"repo":{"created_at":"2011-07-22T09:40:48Z","pushed_at":"2011-11-22T15:51:53Z","private":false,"updated_at":"2011-11-22T15:51:55Z","clone_url":"https://github.com/smenks13/khan-exercises.git","name":"khan-exercises","master_branch":null,"watchers":2,"svn_url":"https://svn.github.com/smenks13/khan-exercises","forks":1,"language":"JavaScript","owner":{"gravatar_id":"1a23849cbe624287e6b5c39efb84217f","id":932075,"url":"https://api.github.com/users/smenks13","login":"smenks13","avatar_url":"https://secure.gravatar.com/avatar/1a23849cbe624287e6b5c39efb84217f?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png"},"id":2087976,"homepage":"http://khanacademy.org/","git_url":"git://github.com/smenks13/khan-exercises.git","description":"A  framework for building exercises to work with Khan Academy.","html_url":"https://github.com/smenks13/khan-exercises","url":"https://api.github.com/repos/smenks13/khan-exercises","size":228,"fork":true,"ssh_url":"git@github.com:smenks13/khan-exercises.git","open_issues":0},"user":{"gravatar_id":"1a23849cbe624287e6b5c39efb84217f","id":932075,"url":"https://api.github.com/users/smenks13","login":"smenks13","avatar_url":"https://secure.gravatar.com/avatar/1a23849cbe624287e6b5c39efb84217f?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-140.png"},"sha":"5c2fe292aac6fb4bdcab7edb8a6b57de02a8a37c","ref":"pluggingInValues","label":"smenks13:pluggingInValues"},"title":"Plugging in values: Negative coefficients + Fill in table","html_url":"https://github.com/Khan/khan-exercises/pull/6397","closed_at":"2011-11-22T16:43:30Z","diff_url":"https://github.com/Khan/khan-exercises/pull/6397.diff","url":"https://api.github.com/repos/Khan/khan-exercises/pulls/6397","merged_at":"2011-11-22T16:43:30Z"},"number":6397}