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20=y/9
We move all terms to the left:
20-(y/9)=0
We add all the numbers together, and all the variables
-(+y/9)+20=0
We get rid of parentheses
-y/9+20=0
We multiply all the terms by the denominator
-y+20*9=0
We add all the numbers together, and all the variables
-1y+180=0
We move all terms containing y to the left, all other terms to the right
-y=-180
y=-180/-1
y=+180
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