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3y+84=5y-16
We move all terms to the left:
3y+84-(5y-16)=0
We get rid of parentheses
3y-5y+16+84=0
We add all the numbers together, and all the variables
-2y+100=0
We move all terms containing y to the left, all other terms to the right
-2y=-100
y=-100/-2
y=+50
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