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2y-20+2y=20+2y-20+2y-20+y+y=720
We move all terms to the left:
2y-20+2y-(20+2y-20+2y-20+y+y)=0
We add all the numbers together, and all the variables
2y+2y-(6y-20)-20=0
We add all the numbers together, and all the variables
4y-(6y-20)-20=0
We get rid of parentheses
4y-6y+20-20=0
We add all the numbers together, and all the variables
-2y=0
y=0/-2
y=0
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