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23=y/2+13
We move all terms to the left:
23-(y/2+13)=0
We get rid of parentheses
-y/2-13+23=0
We multiply all the terms by the denominator
-y-13*2+23*2=0
We add all the numbers together, and all the variables
-1y+20=0
We move all terms containing y to the left, all other terms to the right
-y=-20
y=-20/-1
y=+20
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