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20=p+20p
We move all terms to the left:
20-(p+20p)=0
We add all the numbers together, and all the variables
-(+21p)+20=0
We get rid of parentheses
-21p+20=0
We move all terms containing p to the left, all other terms to the right
-21p=-20
p=-20/-21
p=20/21
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