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-126=2x-6(-x+13)
We simplify the equation to the form, which is simple to understand
-126=2x-6(-x+13)
Reorder the terms in parentheses
-126=2x+(+6x-78)
Remove unnecessary parentheses
-126=+2x+6x-78
We move all terms containing x to the left and all other terms to the right.
-2x-6x=-78+126
We simplify left and right side of the equation.
-8x=+48
We divide both sides of the equation by -8 to get x.
x=-6
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