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3y-8=21y+28
We move all terms to the left:
3y-8-(21y+28)=0
We get rid of parentheses
3y-21y-28-8=0
We add all the numbers together, and all the variables
-18y-36=0
We move all terms containing y to the left, all other terms to the right
-18y=36
y=36/-18
y=-2
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