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9y-66=3y+78
We move all terms to the left:
9y-66-(3y+78)=0
We get rid of parentheses
9y-3y-78-66=0
We add all the numbers together, and all the variables
6y-144=0
We move all terms containing y to the left, all other terms to the right
6y=144
y=144/6
y=24
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