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3y+15=4y-3
We move all terms to the left:
3y+15-(4y-3)=0
We get rid of parentheses
3y-4y+3+15=0
We add all the numbers together, and all the variables
-1y+18=0
We move all terms containing y to the left, all other terms to the right
-y=-18
y=-18/-1
y=+18
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