a+(-12)=-9

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Solution for a+(-12)=-9 equation: 


Simplifying
a + (-12) = -9
a + -12 = -9

Reorder the terms:
-12 + a = -9

Solving
-12 + a = -9

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 = -9 + 12

Combine like terms: -12 + 12 = 0
0 + a = -9 + 12
a = -9 + 12

Combine like terms: -9 + 12 = 3
a = 3

Simplifying
a = 3

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