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8(7a+4)=312
We move all terms to the left:
8(7a+4)-(312)=0
We multiply parentheses
56a+32-312=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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