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3(2p+7)=15)
We move all terms to the left:
3(2p+7)-(15))=0
We add all the numbers together, and all the variables
3(2p+7)=0
We multiply parentheses
6p+21=0
We move all terms containing p to the left, all other terms to the right
6p=-21
p=-21/6
p=-3+1/2
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