Solve math on time.
You have one minute to introduce as many solutions as possible.
On easy is two numbers and two operators + and -.
Solution is never be negative.
On medium is harder because is three numbers, first operator is x and solution may be negative.
On hard is the same but you never know where could be x.
https://andro.io/app/braincalculator
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Brain calculator for Android – Latest Version & Features
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