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12y-6=3y+66
We move all terms to the left:
12y-6-(3y+66)=0
We get rid of parentheses
12y-3y-66-6=0
We add all the numbers together, and all the variables
9y-72=0
We move all terms containing y to the left, all other terms to the right
9y=72
y=72/9
y=8
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