9=12+a

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Solution for 9=12+a equation:


Simplifying
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 = 3
-1a = 3

Divide each side by '-1'.
a = -3

Simplifying
a = -3

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