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9p-2p+2p-9p+4p=20
We move all terms to the left:
9p-2p+2p-9p+4p-(20)=0
We add all the numbers together, and all the variables
4p-20=0
We move all terms containing p to the left, all other terms to the right
4p=20
p=20/4
p=5
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