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6y=2y+84
We move all terms to the left:
6y-(2y+84)=0
We get rid of parentheses
6y-2y-84=0
We add all the numbers together, and all the variables
4y-84=0
We move all terms containing y to the left, all other terms to the right
4y=84
y=84/4
y=21
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