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13=4y-15
We move all terms to the left:
13-(4y-15)=0
We get rid of parentheses
-4y+15+13=0
We add all the numbers together, and all the variables
-4y+28=0
We move all terms containing y to the left, all other terms to the right
-4y=-28
y=-28/-4
y=+7
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