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3y=8y-45
We move all terms to the left:
3y-(8y-45)=0
We get rid of parentheses
3y-8y+45=0
We add all the numbers together, and all the variables
-5y+45=0
We move all terms containing y to the left, all other terms to the right
-5y=-45
y=-45/-5
y=+9
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