X+3y=-15

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Solution for X+3y=-15 equation: 


Simplifying
X + 3y = -15

Solving
X + 3y = -15

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 = -15 + -3y

Combine like terms: 3y + -3y = 0
X + 0 = -15 + -3y
X = -15 + -3y

Simplifying
X = -15 + -3y

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