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-9=2p+12
We move all terms to the left:
-9-(2p+12)=0
We get rid of parentheses
-2p-12-9=0
We add all the numbers together, and all the variables
-2p-21=0
We move all terms containing p to the left, all other terms to the right
-2p=21
p=21/-2
p=-10+1/2
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