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13=y/4+9
We move all terms to the left:
13-(y/4+9)=0
We get rid of parentheses
-y/4-9+13=0
We multiply all the terms by the denominator
-y-9*4+13*4=0
We add all the numbers together, and all the variables
-1y+16=0
We move all terms containing y to the left, all other terms to the right
-y=-16
y=-16/-1
y=+16
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