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7+a/8=13
We move all terms to the left:
7+a/8-(13)=0
We add all the numbers together, and all the variables
a/8-6=0
We multiply all the terms by the denominator
a-6*8=0
We add all the numbers together, and all the variables
a-48=0
We move all terms containing a to the left, all other terms to the right
a=48
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