12a-9+2a-a=-87

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Solution for 12a-9+2a-a=-87 equation:


Simplifying
12a + -9 + 2a + -1a = -87

Reorder the terms:
-9 + 12a + 2a + -1a = -87

Combine like terms: 12a + 2a = 14a
-9 + 14a + -1a = -87

Combine like terms: 14a + -1a = 13a
-9 + 13a = -87

Solving
-9 + 13a = -87

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 13a = -87 + 9

Combine like terms: -9 + 9 = 0
0 + 13a = -87 + 9
13a = -87 + 9

Combine like terms: -87 + 9 = -78
13a = -78

Divide each side by '13'.
a = -6

Simplifying
a = -6

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