-129=-15a-9

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Solution for -129=-15a-9 equation:


Simplifying
-129 = -15a + -9

Reorder the terms:
-129 = -9 + -15a

Solving
-129 = -9 + -15a

Solving for variable 'a'.

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

Add '15a' to each side of the equation.
-129 + 15a = -9 + -15a + 15a

Combine like terms: -15a + 15a = 0
-129 + 15a = -9 + 0
-129 + 15a = -9

Add '129' to each side of the equation.
-129 + 129 + 15a = -9 + 129

Combine like terms: -129 + 129 = 0
0 + 15a = -9 + 129
15a = -9 + 129

Combine like terms: -9 + 129 = 120
15a = 120

Divide each side by '15'.
a = 8

Simplifying
a = 8

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