-12=3a+9

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Solution for -12=3a+9 equation:


Simplifying
-12 = 3a + 9

Reorder the terms:
-12 = 9 + 3a

Solving
-12 = 9 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
-12 + -3a = 9 + 3a + -3a

Combine like terms: 3a + -3a = 0
-12 + -3a = 9 + 0
-12 + -3a = 9

Add '12' to each side of the equation.
-12 + 12 + -3a = 9 + 12

Combine like terms: -12 + 12 = 0
0 + -3a = 9 + 12
-3a = 9 + 12

Combine like terms: 9 + 12 = 21
-3a = 21

Divide each side by '-3'.
a = -7

Simplifying
a = -7

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