90=x+y

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Solution for 90=x+y equation: 


Simplifying
90 = x + y

Solving
90 = x + y

Solving for variable 'x'.

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

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

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

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

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

Divide each side by '-1'.
x = 90 + -1y

Simplifying
x = 90 + -1y

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