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15y+20=12y+41
We move all terms to the left:
15y+20-(12y+41)=0
We get rid of parentheses
15y-12y-41+20=0
We add all the numbers together, and all the variables
3y-21=0
We move all terms containing y to the left, all other terms to the right
3y=21
y=21/3
y=7
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