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2y+84=5y+66
We move all terms to the left:
2y+84-(5y+66)=0
We get rid of parentheses
2y-5y-66+84=0
We add all the numbers together, and all the variables
-3y+18=0
We move all terms containing y to the left, all other terms to the right
-3y=-18
y=-18/-3
y=+6
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