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3y+18=13y-12
We move all terms to the left:
3y+18-(13y-12)=0
We get rid of parentheses
3y-13y+12+18=0
We add all the numbers together, and all the variables
-10y+30=0
We move all terms containing y to the left, all other terms to the right
-10y=-30
y=-30/-10
y=+3
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