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-8a-7(-a+8)=-64
We simplify the equation to the form, which is simple to understand
-8a-7(-a+8)=-64
Reorder the terms in parentheses
-8a+(+7a-56)=-64
Remove unnecessary parentheses
-8a+7a-56=-64
We move all terms containing a to the left and all other terms to the right.
-8a+7a=-64+56
We simplify left and right side of the equation.
-1a=-8
We divide both sides of the equation by -1 to get a.
a=8
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