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20-4y=2y-4
We move all terms to the left:
20-4y-(2y-4)=0
We get rid of parentheses
-4y-2y+4+20=0
We add all the numbers together, and all the variables
-6y+24=0
We move all terms containing y to the left, all other terms to the right
-6y=-24
y=-24/-6
y=+4
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