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Fix two with combining_like_terms_2:
Summary: In the ax_fbx_fd problem type, the variable coefficient could simplify to 0 and require entering "0x+5" instead of just "5", for example. Added a data-ensure to ensure the coefficient is always non-zero. Also, the final hint in the eax_ec_fd_fbx problem type left off the constant term unless it was 0 instead of the other way around. Test Plan: Test locally to verify the two problems were fixed in these two seeds: http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/combining_like_terms_2.html?seed=62&problem=ax_fbx_fd&debug http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/combining_like_terms_2.html?seed=42&problem=eax_ec_fd_fbx&debug Reviewers: stephanie, yunfangjuan Reviewed By: stephanie Differential Revision: http://phabricator.khanacademy.org/D843
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