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y=8y+9=
We move all terms to the left:
y-(8y+9)=0
We get rid of parentheses
y-8y-9=0
We add all the numbers together, and all the variables
-7y-9=0
We move all terms containing y to the left, all other terms to the right
-7y=9
y=9/-7
y=-1+2/7
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