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-7x-4(-4x-17)=-40
We simplify the equation to the form, which is simple to understand
-7x-4(-4x-17)=-40
Reorder the terms in parentheses
-7x+(+16x+68)=-40
Remove unnecessary parentheses
-7x+16x+68=-40
We move all terms containing x to the left and all other terms to the right.
-7x+16x=-40-68
We simplify left and right side of the equation.
+9x=-108
We divide both sides of the equation by 9 to get x.
x=-12
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