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20y+50=5y-100
We move all terms to the left:
20y+50-(5y-100)=0
We get rid of parentheses
20y-5y+100+50=0
We add all the numbers together, and all the variables
15y+150=0
We move all terms containing y to the left, all other terms to the right
15y=-150
y=-150/15
y=-10
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