multiple formulas in equation questions getting messed up
multiple formulas in equation questions getting messed up

It looks like all the formulas were getting concatenated
into a single formula on save.

fixes #3980

Change-Id: Ibefc62621b684de180ca15567694bda0f5a8221d
Reviewed-on: https://gerrit.instructure.com/2542
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>

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