Solve[Z^2 - (p*q - 3 r) Z + (9 r^2 + r*p^3 - 6 p*q*r + q^3) == 0, Z]Solve[Z^2 - (p*q - 3 r) Z + (9 r^2 + r*p^3 - 6 p*q*r + q^3) == 0, Z]

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