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-3x+5(-2x+14)=-21
We simplify the equation to the form, which is simple to understand
-3x+5(-2x+14)=-21
Reorder the terms in parentheses
-3x+(-10x+70)=-21
Remove unnecessary parentheses
-3x-10x+70=-21
We move all terms containing x to the left and all other terms to the right.
-3x-10x=-21-70
We simplify left and right side of the equation.
-13x=-91
We divide both sides of the equation by -13 to get x.
x=7
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