x+3y=-y

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Solution for x+3y=-y equation: 


Simplifying
x + 3y = -1y

Solving
x + 3y = -1y

Solving for variable 'x'.

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

Add '-3y' to each side of the equation.
x + 3y + -3y = -1y + -3y

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

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

Simplifying
x = -4y

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