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13=a/2+9
We move all terms to the left:
13-(a/2+9)=0
We get rid of parentheses
-a/2-9+13=0
We multiply all the terms by the denominator
-a-9*2+13*2=0
We add all the numbers together, and all the variables
-1a+8=0
We move all terms containing a to the left, all other terms to the right
-a=-8
a=-8/-1
a=+8
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