31-a=-12

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Solution for 31-a=-12 equation: 


Simplifying
31 + -1a = -12

Solving
31 + -1a = -12

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-31' to each side of the equation.
31 + -31 + -1a = -12 + -31

Combine like terms: 31 + -31 = 0
0 + -1a = -12 + -31
-1a = -12 + -31

Combine like terms: -12 + -31 = -43
-1a = -43

Divide each side by '-1'.
a = 43

Simplifying
a = 43

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