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-3(4x-7)=-15
We simplify the equation to the form, which is simple to understand
-3(4x-7)=-15
Reorder the terms in parentheses
+(-12x+21)=-15
Remove unnecessary parentheses
-12x+21=-15
We move all terms containing x to the left and all other terms to the right.
-12x=-15-21
We simplify left and right side of the equation.
-12x=-36
We divide both sides of the equation by -12 to get x.
x=3
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