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13=a/8+6
We move all terms to the left:
13-(a/8+6)=0
We get rid of parentheses
-a/8-6+13=0
We multiply all the terms by the denominator
-a-6*8+13*8=0
We add all the numbers together, and all the variables
-1a+56=0
We move all terms containing a to the left, all other terms to the right
-a=-56
a=-56/-1
a=+56
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