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3y-4+y+20=6y+20-4y
We move all terms to the left:
3y-4+y+20-(6y+20-4y)=0
We add all the numbers together, and all the variables
3y+y-(2y+20)-4+20=0
We add all the numbers together, and all the variables
4y-(2y+20)+16=0
We get rid of parentheses
4y-2y-20+16=0
We add all the numbers together, and all the variables
2y-4=0
We move all terms containing y to the left, all other terms to the right
2y=4
y=4/2
y=2
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