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20=2y-5
We move all terms to the left:
20-(2y-5)=0
We get rid of parentheses
-2y+5+20=0
We add all the numbers together, and all the variables
-2y+25=0
We move all terms containing y to the left, all other terms to the right
-2y=-25
y=-25/-2
y=12+1/2
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