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13=4y-42
We move all terms to the left:
13-(4y-42)=0
We get rid of parentheses
-4y+42+13=0
We add all the numbers together, and all the variables
-4y+55=0
We move all terms containing y to the left, all other terms to the right
-4y=-55
y=-55/-4
y=13+3/4
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