P(x)=4x4+8x3-7x2-21x-9.

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Solution for P(x)=4x4+8x3-7x2-21x-9. equation: 



(P)=4P^4+8P^3-7P^2-21P-9.

We move all terms to the left:

(P)-(4P^4+8P^3-7P^2-21P-9.)=0

We do not support ePpression: P^4

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