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20+4p=9p-20
We move all terms to the left:
20+4p-(9p-20)=0
We get rid of parentheses
4p-9p+20+20=0
We add all the numbers together, and all the variables
-5p+40=0
We move all terms containing p to the left, all other terms to the right
-5p=-40
p=-40/-5
p=+8
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