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a/8-7=13
We move all terms to the left:
a/8-7-(13)=0
We add all the numbers together, and all the variables
a/8-20=0
We multiply all the terms by the denominator
a-20*8=0
We add all the numbers together, and all the variables
a-160=0
We move all terms containing a to the left, all other terms to the right
a=160
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