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p+2p+3p+15=4p-20+9
We move all terms to the left:
p+2p+3p+15-(4p-20+9)=0
We add all the numbers together, and all the variables
p+2p+3p-(4p-11)+15=0
We add all the numbers together, and all the variables
6p-(4p-11)+15=0
We get rid of parentheses
6p-4p+11+15=0
We add all the numbers together, and all the variables
2p+26=0
We move all terms containing p to the left, all other terms to the right
2p=-26
p=-26/2
p=-13
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