180-x=[3(90-x)]-12

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Solution for 180-x=[3(90-x)]-12 equation:


Simplifying
180 + -1x = [3(90 + -1x)] + -12
180 + -1x = [(90 * 3 + -1x * 3)] + -12
180 + -1x = [(270 + -3x)] + -12
180 + -1x = [270 + -3x] + -12

Remove brackets around [270 + -3x]
180 + -1x = 270 + -3x + -12

Reorder the terms:
180 + -1x = 270 + -12 + -3x

Combine like terms: 270 + -12 = 258
180 + -1x = 258 + -3x

Solving
180 + -1x = 258 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
180 + -1x + 3x = 258 + -3x + 3x

Combine like terms: -1x + 3x = 2x
180 + 2x = 258 + -3x + 3x

Combine like terms: -3x + 3x = 0
180 + 2x = 258 + 0
180 + 2x = 258

Add '-180' to each side of the equation.
180 + -180 + 2x = 258 + -180

Combine like terms: 180 + -180 = 0
0 + 2x = 258 + -180
2x = 258 + -180

Combine like terms: 258 + -180 = 78
2x = 78

Divide each side by '2'.
x = 39

Simplifying
x = 39

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