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5p-3(p+3)=-21
We move all terms to the left:
5p-3(p+3)-(-21)=0
We add all the numbers together, and all the variables
5p-3(p+3)+21=0
We multiply parentheses
5p-3p-9+21=0
We add all the numbers together, and all the variables
2p+12=0
We move all terms containing p to the left, all other terms to the right
2p=-12
p=-12/2
p=-6
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