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