X+y=2x-y

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Solution for X+y=2x-y equation: 


Simplifying
X + y = 2x + -1y

Solving
X + y = 2x + -1y

Solving for variable 'X'.

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

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

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

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

Simplifying
X = 2x + -2y

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