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100=4y+y
We move all terms to the left:
100-(4y+y)=0
We add all the numbers together, and all the variables
-(+5y)+100=0
We get rid of parentheses
-5y+100=0
We move all terms containing y to the left, all other terms to the right
-5y=-100
y=-100/-5
y=+20
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