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