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13=a/5+4
We move all terms to the left:
13-(a/5+4)=0
We get rid of parentheses
-a/5-4+13=0
We multiply all the terms by the denominator
-a-4*5+13*5=0
We add all the numbers together, and all the variables
-1a+45=0
We move all terms containing a to the left, all other terms to the right
-a=-45
a=-45/-1
a=+45
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