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9=2y+8y=
We move all terms to the left:
9-(2y+8y)=0
We add all the numbers together, and all the variables
-(+10y)+9=0
We get rid of parentheses
-10y+9=0
We move all terms containing y to the left, all other terms to the right
-10y=-9
y=-9/-10
y=9/10
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