21=p-4p

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Solution for 21=p-4p equation: 



21=p-4p

We move all terms to the left:

21-(p-4p)=0

We add all the numbers together, and all the variables

-(-3p)+21=0

We get rid of parentheses

3p+21=0

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

3p=-21

p=-21/3

p=-7

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