18=x+y+y

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Solution for 18=x+y+y equation:


Simplifying
18 = x + y + y

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

Solving
18 = x + 2y

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.
18 + -1x = x + -1x + 2y

Combine like terms: x + -1x = 0
18 + -1x = 0 + 2y
18 + -1x = 2y

Add '-18' to each side of the equation.
18 + -18 + -1x = -18 + 2y

Combine like terms: 18 + -18 = 0
0 + -1x = -18 + 2y
-1x = -18 + 2y

Divide each side by '-1'.
x = 18 + -2y

Simplifying
x = 18 + -2y

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