-3p-21=21

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Solution for -3p-21=21 equation: 



-3p-21=21

We move all terms to the left:

-3p-21-(21)=0

We add all the numbers together, and all the variables

-3p-42=0

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

-3p=42

p=42/-3

p=-14

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