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100=5y-20
We move all terms to the left:
100-(5y-20)=0
We get rid of parentheses
-5y+20+100=0
We add all the numbers together, and all the variables
-5y+120=0
We move all terms containing y to the left, all other terms to the right
-5y=-120
y=-120/-5
y=+24
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