9=a-12

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Solution for 9=a-12 equation:


Simplifying
9 = a + -12

Reorder the terms:
9 = -12 + a

Solving
9 = -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.
9 + -1a = -12 + a + -1a

Combine like terms: a + -1a = 0
9 + -1a = -12 + 0
9 + -1a = -12

Add '-9' to each side of the equation.
9 + -9 + -1a = -12 + -9

Combine like terms: 9 + -9 = 0
0 + -1a = -12 + -9
-1a = -12 + -9

Combine like terms: -12 + -9 = -21
-1a = -21

Divide each side by '-1'.
a = 21

Simplifying
a = 21

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