-3=a-12

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Solution for -3=a-12 equation:


Simplifying
-3 = a + -12

Reorder the terms:
-3 = -12 + a

Solving
-3 = -12 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-3 + -1a = -12 + a + -1a

Combine like terms: a + -1a = 0
-3 + -1a = -12 + 0
-3 + -1a = -12

Add '3' to each side of the equation.
-3 + 3 + -1a = -12 + 3

Combine like terms: -3 + 3 = 0
0 + -1a = -12 + 3
-1a = -12 + 3

Combine like terms: -12 + 3 = -9
-1a = -9

Divide each side by '-1'.
a = 9

Simplifying
a = 9

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