-9a-12=8-4a

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Solution for -9a-12=8-4a equation:


Simplifying
-9a + -12 = 8 + -4a

Reorder the terms:
-12 + -9a = 8 + -4a

Solving
-12 + -9a = 8 + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
-12 + -9a + 4a = 8 + -4a + 4a

Combine like terms: -9a + 4a = -5a
-12 + -5a = 8 + -4a + 4a

Combine like terms: -4a + 4a = 0
-12 + -5a = 8 + 0
-12 + -5a = 8

Add '12' to each side of the equation.
-12 + 12 + -5a = 8 + 12

Combine like terms: -12 + 12 = 0
0 + -5a = 8 + 12
-5a = 8 + 12

Combine like terms: 8 + 12 = 20
-5a = 20

Divide each side by '-5'.
a = -4

Simplifying
a = -4

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