6+9=x-12

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Solution for 6+9=x-12 equation: 


Simplifying
6 + 9 = x + -12

Combine like terms: 6 + 9 = 15
15 = x + -12

Reorder the terms:
15 = -12 + x

Solving
15 = -12 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
15 + -1x = -12 + x + -1x

Combine like terms: x + -1x = 0
15 + -1x = -12 + 0
15 + -1x = -12

Add '-15' to each side of the equation.
15 + -15 + -1x = -12 + -15

Combine like terms: 15 + -15 = 0
0 + -1x = -12 + -15
-1x = -12 + -15

Combine like terms: -12 + -15 = -27
-1x = -27

Divide each side by '-1'.
x = 27

Simplifying
x = 27

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