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90=18y/90
We move all terms to the left:
90-(18y/90)=0
We add all the numbers together, and all the variables
-(+18y/90)+90=0
We get rid of parentheses
-18y/90+90=0
We multiply all the terms by the denominator
-18y+90*90=0
We add all the numbers together, and all the variables
-18y+8100=0
We move all terms containing y to the left, all other terms to the right
-18y=-8100
y=-8100/-18
y=+450
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