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20+80=5.25y
We move all terms to the left:
20+80-(5.25y)=0
We add all the numbers together, and all the variables
-(+5.25y)+20+80=0
We add all the numbers together, and all the variables
-(+5.25y)+100=0
We get rid of parentheses
-5.25y+100=0
We move all terms containing y to the left, all other terms to the right
-5.25y=-100
y=-100/-5.25
y=19+0.25/5.25
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