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y=2y+4y-20
We move all terms to the left:
y-(2y+4y-20)=0
We add all the numbers together, and all the variables
y-(6y-20)=0
We get rid of parentheses
y-6y+20=0
We add all the numbers together, and all the variables
-5y+20=0
We move all terms containing y to the left, all other terms to the right
-5y=-20
y=-20/-5
y=+4
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