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80=2x-7(4+x)
We simplify the equation to the form, which is simple to understand
80=2x-7(4+x)
Reorder the terms in parentheses
80=2x+(-28-7x)
Remove unnecessary parentheses
+80=+2x-28-7x
We move all terms containing x to the left and all other terms to the right.
-2x+7x=-28-80
We simplify left and right side of the equation.
+5x=-108
We divide both sides of the equation by 5 to get x.
x=-21.6
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