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20+y=2y+13
We move all terms to the left:
20+y-(2y+13)=0
We get rid of parentheses
y-2y-13+20=0
We add all the numbers together, and all the variables
-1y+7=0
We move all terms containing y to the left, all other terms to the right
-y=-7
y=-7/-1
y=+7
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