21=^2+4p

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Solution for 21=^2+4p equation: 



21=^2+4p

We move all terms to the left:

21-(^2+4p)=0

We get rid of parentheses

-4p+21-^2=0

We add all the numbers together, and all the variables

-4p=0

p=0/-4

p=0

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