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2p+7p+(-20p)+8p=15
We move all terms to the left:
2p+7p+(-20p)+8p-(15)=0
We add all the numbers together, and all the variables
17p+(-20p)-15=0
We get rid of parentheses
17p-20p-15=0
We add all the numbers together, and all the variables
-3p-15=0
We move all terms containing p to the left, all other terms to the right
-3p=15
p=15/-3
p=-5
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