a-12=-31

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Solution for a-12=-31 equation: 


Simplifying
a + -12 = -31

Reorder the terms:
-12 + a = -31

Solving
-12 + a = -31

Solving for variable 'a'.

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

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

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

Combine like terms: -31 + 12 = -19
a = -19

Simplifying
a = -19

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