x=(90-x)-12

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


Simplifying
x = (90 + -1x) + -12

Remove parenthesis around (90 + -1x)
x = 90 + -1x + -12

Reorder the terms:
x = 90 + -12 + -1x

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

Solving
x = 78 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
x + x = 78 + -1x + x

Combine like terms: x + x = 2x
2x = 78 + -1x + x

Combine like terms: -1x + x = 0
2x = 78 + 0
2x = 78

Divide each side by '2'.
x = 39

Simplifying
x = 39

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