x+y+y=18

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Solution for x+y+y=18 equation: 


Simplifying
x + y + y = 18

Combine like terms: y + y = 2y
x + 2y = 18

Solving
x + 2y = 18

Solving for variable 'x'.

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

Add '-2y' to each side of the equation.
x + 2y + -2y = 18 + -2y

Combine like terms: 2y + -2y = 0
x + 0 = 18 + -2y
x = 18 + -2y

Simplifying
x = 18 + -2y

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