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13=2y+7
We move all terms to the left:
13-(2y+7)=0
We get rid of parentheses
-2y-7+13=0
We add all the numbers together, and all the variables
-2y+6=0
We move all terms containing y to the left, all other terms to the right
-2y=-6
y=-6/-2
y=+3
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