2(x-y)=-18

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Solution for 2(x-y)=-18 equation: 


Simplifying
2(x + -1y) = -18
(x * 2 + -1y * 2) = -18
(2x + -2y) = -18

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

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

Divide each side by '2'.
x = -9 + y

Simplifying
x = -9 + y

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