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8(7+a)=160
We move all terms to the left:
8(7+a)-(160)=0
We add all the numbers together, and all the variables
8(a+7)-160=0
We multiply parentheses
8a+56-160=0
We add all the numbers together, and all the variables
8a-104=0
We move all terms containing a to the left, all other terms to the right
8a=104
a=104/8
a=13
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