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-12x-90=-4x+30
We simplify the equation to the form, which is simple to understand
-12x-90=-4x+30
We move all terms containing x to the left and all other terms to the right.
-12x+4x=+30+90
We simplify left and right side of the equation.
-8x=+120
We divide both sides of the equation by -8 to get x.
x=-15
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