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15y+21=5y+41
We move all terms to the left:
15y+21-(5y+41)=0
We get rid of parentheses
15y-5y-41+21=0
We add all the numbers together, and all the variables
10y-20=0
We move all terms containing y to the left, all other terms to the right
10y=20
y=20/10
y=2
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