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7+4(2a=15)=-13
We move all terms to the left:
7+4(2a-(15))=0
We multiply parentheses
8a-60+7=0
We add all the numbers together, and all the variables
8a-53=0
We move all terms containing a to the left, all other terms to the right
8a=53
a=53/8
a=6+5/8
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