p-8p=-21

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Solution for p-8p=-21 equation: 



p-8p=-21

We move all terms to the left:

p-8p-(-21)=0

We add all the numbers together, and all the variables

-7p+21=0

We move all terms containing p to the left, all other terms to the right

-7p=-21

p=-21/-7

p=+3

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