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8-9y=21y-17
We move all terms to the left:
8-9y-(21y-17)=0
We get rid of parentheses
-9y-21y+17+8=0
We add all the numbers together, and all the variables
-30y+25=0
We move all terms containing y to the left, all other terms to the right
-30y=-25
y=-25/-30
y=5/6
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