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13=y/3+9
We move all terms to the left:
13-(y/3+9)=0
We get rid of parentheses
-y/3-9+13=0
We multiply all the terms by the denominator
-y-9*3+13*3=0
We add all the numbers together, and all the variables
-1y+12=0
We move all terms containing y to the left, all other terms to the right
-y=-12
y=-12/-1
y=+12
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