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y=45y+90
We move all terms to the left:
y-(45y+90)=0
We get rid of parentheses
y-45y-90=0
We add all the numbers together, and all the variables
-44y-90=0
We move all terms containing y to the left, all other terms to the right
-44y=90
y=90/-44
y=-2+1/22
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