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-4x-3(-5x-7)=131
We simplify the equation to the form, which is simple to understand
-4x-3(-5x-7)=131
Reorder the terms in parentheses
-4x+(+15x+21)=131
Remove unnecessary parentheses
-4x+15x+21=+131
We move all terms containing x to the left and all other terms to the right.
-4x+15x=+131-21
We simplify left and right side of the equation.
+11x=+110
We divide both sides of the equation by 11 to get x.
x=10
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