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42=y/5+13
We move all terms to the left:
42-(y/5+13)=0
We get rid of parentheses
-y/5-13+42=0
We multiply all the terms by the denominator
-y-13*5+42*5=0
We add all the numbers together, and all the variables
-1y+145=0
We move all terms containing y to the left, all other terms to the right
-y=-145
y=-145/-1
y=+145
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