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(-2p)-38=40
We move all terms to the left:
(-2p)-38-(40)=0
We add all the numbers together, and all the variables
(-2p)-78=0
We get rid of parentheses
-2p-78=0
We move all terms containing p to the left, all other terms to the right
-2p=78
p=78/-2
p=-39
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