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3p+84=p+40
We move all terms to the left:
3p+84-(p+40)=0
We get rid of parentheses
3p-p-40+84=0
We add all the numbers together, and all the variables
2p+44=0
We move all terms containing p to the left, all other terms to the right
2p=-44
p=-44/2
p=-22
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