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4x-4(4x-5)=-40
We simplify the equation to the form, which is simple to understand
4x-4(4x-5)=-40
Reorder the terms in parentheses
4x+(-16x+20)=-40
Remove unnecessary parentheses
+4x-16x+20=-40
We move all terms containing x to the left and all other terms to the right.
+4x-16x=-40-20
We simplify left and right side of the equation.
-12x=-60
We divide both sides of the equation by -12 to get x.
x=5
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