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3p-15=p+9
We move all terms to the left:
3p-15-(p+9)=0
We get rid of parentheses
3p-p-9-15=0
We add all the numbers together, and all the variables
2p-24=0
We move all terms containing p to the left, all other terms to the right
2p=24
p=24/2
p=12
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