(12-2x)+x=90

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Solution for (12-2x)+x=90 equation: 


Simplifying
(12 + -2x) + x = 90

Remove parenthesis around (12 + -2x)
12 + -2x + x = 90

Combine like terms: -2x + x = -1x
12 + -1x = 90

Solving
12 + -1x = 90

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + -1x = 90 + -12

Combine like terms: 12 + -12 = 0
0 + -1x = 90 + -12
-1x = 90 + -12

Combine like terms: 90 + -12 = 78
-1x = 78

Divide each side by '-1'.
x = -78

Simplifying
x = -78

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