90=x+(x-20)

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Solution for 90=x+(x-20) equation: 


Simplifying
90 = x + (x + -20)

Reorder the terms:
90 = x + (-20 + x)

Remove parenthesis around (-20 + x)
90 = x + -20 + x

Reorder the terms:
90 = -20 + x + x

Combine like terms: x + x = 2x
90 = -20 + 2x

Solving
90 = -20 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
90 + -2x = -20 + 2x + -2x

Combine like terms: 2x + -2x = 0
90 + -2x = -20 + 0
90 + -2x = -20

Add '-90' to each side of the equation.
90 + -90 + -2x = -20 + -90

Combine like terms: 90 + -90 = 0
0 + -2x = -20 + -90
-2x = -20 + -90

Combine like terms: -20 + -90 = -110
-2x = -110

Divide each side by '-2'.
x = 55

Simplifying
x = 55

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