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6y+18=3y-36
We move all terms to the left:
6y+18-(3y-36)=0
We get rid of parentheses
6y-3y+36+18=0
We add all the numbers together, and all the variables
3y+54=0
We move all terms containing y to the left, all other terms to the right
3y=-54
y=-54/3
y=-18
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