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12=15-3y
We move all terms to the left:
12-(15-3y)=0
We add all the numbers together, and all the variables
-(-3y+15)+12=0
We get rid of parentheses
3y-15+12=0
We add all the numbers together, and all the variables
3y-3=0
We move all terms containing y to the left, all other terms to the right
3y=3
y=3/3
y=1
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