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10y-1=5y+21
We move all terms to the left:
10y-1-(5y+21)=0
We get rid of parentheses
10y-5y-21-1=0
We add all the numbers together, and all the variables
5y-22=0
We move all terms containing y to the left, all other terms to the right
5y=22
y=22/5
y=4+2/5
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