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13=a/5-6
We move all terms to the left:
13-(a/5-6)=0
We get rid of parentheses
-a/5+6+13=0
We multiply all the terms by the denominator
-a+6*5+13*5=0
We add all the numbers together, and all the variables
-1a+95=0
We move all terms containing a to the left, all other terms to the right
-a=-95
a=-95/-1
a=+95
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