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20y=9+3y
We move all terms to the left:
20y-(9+3y)=0
We add all the numbers together, and all the variables
20y-(3y+9)=0
We get rid of parentheses
20y-3y-9=0
We add all the numbers together, and all the variables
17y-9=0
We move all terms containing y to the left, all other terms to the right
17y=9
y=9/17
y=9/17
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