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-7(8a-7)=329
We move all terms to the left:
-7(8a-7)-(329)=0
We multiply parentheses
-56a+49-329=0
We add all the numbers together, and all the variables
-56a-280=0
We move all terms containing a to the left, all other terms to the right
-56a=280
a=280/-56
a=-5
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