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4p+9=2p+1
We move all terms to the left:
4p+9-(2p+1)=0
We get rid of parentheses
4p-2p-1+9=0
We add all the numbers together, and all the variables
2p+8=0
We move all terms containing p to the left, all other terms to the right
2p=-8
p=-8/2
p=-4
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