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20y-140=17y-50
We move all terms to the left:
20y-140-(17y-50)=0
We get rid of parentheses
20y-17y+50-140=0
We add all the numbers together, and all the variables
3y-90=0
We move all terms containing y to the left, all other terms to the right
3y=90
y=90/3
y=30
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