X+y=3x-4y

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Solution for X+y=3x-4y equation: 


Simplifying
X + y = 3x + -4y

Solving
X + y = 3x + -4y

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 = 3x + -4y + -1y

Combine like terms: y + -1y = 0
X + 0 = 3x + -4y + -1y
X = 3x + -4y + -1y

Combine like terms: -4y + -1y = -5y
X = 3x + -5y

Simplifying
X = 3x + -5y

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