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8=a/13
We move all terms to the left:
8-(a/13)=0
We add all the numbers together, and all the variables
-(+a/13)+8=0
We get rid of parentheses
-a/13+8=0
We multiply all the terms by the denominator
-a+8*13=0
We add all the numbers together, and all the variables
-1a+104=0
We move all terms containing a to the left, all other terms to the right
-a=-104
a=-104/-1
a=+104
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