3x+12y=-84

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Solution for 3x+12y=-84 equation: 


Simplifying
3x + 12y = -84

Solving
3x + 12y = -84

Solving for variable 'x'.

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

Add '-12y' to each side of the equation.
3x + 12y + -12y = -84 + -12y

Combine like terms: 12y + -12y = 0
3x + 0 = -84 + -12y
3x = -84 + -12y

Divide each side by '3'.
x = -28 + -4y

Simplifying
x = -28 + -4y

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