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10y-27=2y+21
We move all terms to the left:
10y-27-(2y+21)=0
We get rid of parentheses
10y-2y-21-27=0
We add all the numbers together, and all the variables
8y-48=0
We move all terms containing y to the left, all other terms to the right
8y=48
y=48/8
y=6
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