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13+2y=7y-12
We move all terms to the left:
13+2y-(7y-12)=0
We get rid of parentheses
2y-7y+12+13=0
We add all the numbers together, and all the variables
-5y+25=0
We move all terms containing y to the left, all other terms to the right
-5y=-25
y=-25/-5
y=+5
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