-9(a-12)+20=20

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Solution for -9(a-12)+20=20 equation:


Simplifying
-9(a + -12) + 20 = 20

Reorder the terms:
-9(-12 + a) + 20 = 20
(-12 * -9 + a * -9) + 20 = 20
(108 + -9a) + 20 = 20

Reorder the terms:
108 + 20 + -9a = 20

Combine like terms: 108 + 20 = 128
128 + -9a = 20

Solving
128 + -9a = 20

Solving for variable 'a'.

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

Add '-128' to each side of the equation.
128 + -128 + -9a = 20 + -128

Combine like terms: 128 + -128 = 0
0 + -9a = 20 + -128
-9a = 20 + -128

Combine like terms: 20 + -128 = -108
-9a = -108

Divide each side by '-9'.
a = 12

Simplifying
a = 12

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