3x-y=-12

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Solution for 3x-y=-12 equation: 


Simplifying
3x + -1y = -12

Solving
3x + -1y = -12

Solving for variable 'x'.

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

Add 'y' to each side of the equation.
3x + -1y + y = -12 + y

Combine like terms: -1y + y = 0
3x + 0 = -12 + y
3x = -12 + y

Divide each side by '3'.
x = -4 + 0.3333333333y

Simplifying
x = -4 + 0.3333333333y

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