-3x-12y=15

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Solution for -3x-12y=15 equation: 


Simplifying
-3x + -12y = 15

Solving
-3x + -12y = 15

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 = 15 + 12y

Combine like terms: -12y + 12y = 0
-3x + 0 = 15 + 12y
-3x = 15 + 12y

Divide each side by '-3'.
x = -5 + -4y

Simplifying
x = -5 + -4y

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