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p+4=2p+15
We move all terms to the left:
p+4-(2p+15)=0
We get rid of parentheses
p-2p-15+4=0
We add all the numbers together, and all the variables
-1p-11=0
We move all terms containing p to the left, all other terms to the right
-p=11
p=11/-1
p=-11
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