90=x+20+x

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Solution for 90=x+20+x equation: 


Simplifying
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 = -70
-2x = -70

Divide each side by '-2'.
x = 35

Simplifying
x = 35

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