12-a=-75

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Solution for 12-a=-75 equation: 


Simplifying
12 + -1a = -75

Solving
12 + -1a = -75

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 + -1a = -75 + -12

Combine like terms: 12 + -12 = 0
0 + -1a = -75 + -12
-1a = -75 + -12

Combine like terms: -75 + -12 = -87
-1a = -87

Divide each side by '-1'.
a = 87

Simplifying
a = 87

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