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66+5y-21=16y-11-3y
We move all terms to the left:
66+5y-21-(16y-11-3y)=0
We add all the numbers together, and all the variables
5y-(13y-11)+66-21=0
We add all the numbers together, and all the variables
5y-(13y-11)+45=0
We get rid of parentheses
5y-13y+11+45=0
We add all the numbers together, and all the variables
-8y+56=0
We move all terms containing y to the left, all other terms to the right
-8y=-56
y=-56/-8
y=+7
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