y+(x-y)+x+(x-y)=90

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


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

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

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

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

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

Combine like terms: 2x + x = 3x
3x + y + -1y + -1y = 90

Combine like terms: y + -1y = 0
3x + 0 + -1y = 90
3x + -1y = 90

Solving
3x + -1y = 90

Solving for variable 'x'.

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

Add 'y' to each side of the equation.
3x + -1y + y = 90 + y

Combine like terms: -1y + y = 0
3x + 0 = 90 + y
3x = 90 + y

Divide each side by '3'.
x = 30 + 0.3333333333y

Simplifying
x = 30 + 0.3333333333y

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