I suggest you ...

I love your app, and you probably should not be allowed to divide by 'x'

I recently purchased dragonbox2 as a parent and while working through the problems found that the chapter 4-20 problem called for dividing by 'x'. The issue with this being you do not know the value for 'x' and could therefore unknowingly be dividing by 0 and end up missing potential solutions. This message board explains this in better detail:

http://math.stackexchange.com/questions/67994/why-should-you-never-divide-both-sides-by-a-variable-when-solving-an-equation

Dividing by a variable is generally a 'bad habit' that should be avoided.

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