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15p-9=2p+12
We move all terms to the left:
15p-9-(2p+12)=0
We get rid of parentheses
15p-2p-12-9=0
We add all the numbers together, and all the variables
13p-21=0
We move all terms containing p to the left, all other terms to the right
13p=21
p=21/13
p=1+8/13
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