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18p+3p-13p-4p+2p=12
We move all terms to the left:
18p+3p-13p-4p+2p-(12)=0
We add all the numbers together, and all the variables
6p-12=0
We move all terms containing p to the left, all other terms to the right
6p=12
p=12/6
p=2
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