-3x-12x=-90

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Solution for -3x-12x=-90 equation: 


Simplifying
-3x + -12x = -90

Combine like terms: -3x + -12x = -15x
-15x = -90

Solving
-15x = -90

Solving for variable 'x'.

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

Divide each side by '-15'.
x = 6

Simplifying
x = 6

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