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13=a/3+7
We move all terms to the left:
13-(a/3+7)=0
We get rid of parentheses
-a/3-7+13=0
We multiply all the terms by the denominator
-a-7*3+13*3=0
We add all the numbers together, and all the variables
-1a+18=0
We move all terms containing a to the left, all other terms to the right
-a=-18
a=-18/-1
a=+18
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