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3y-3=4y-12
We move all terms to the left:
3y-3-(4y-12)=0
We get rid of parentheses
3y-4y+12-3=0
We add all the numbers together, and all the variables
-1y+9=0
We move all terms containing y to the left, all other terms to the right
-y=-9
y=-9/-1
y=+9
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