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9y^2+45y=9y^2+45
We move all terms to the left:
9y^2+45y-(9y^2+45)=0
We get rid of parentheses
9y^2-9y^2+45y-45=0
We add all the numbers together, and all the variables
45y-45=0
We move all terms containing y to the left, all other terms to the right
45y=45
y=45/45
y=1
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