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The roots of the cubic equation
x3−4x2+6x−5=0x^3 - 4x^2 + 6x - 5 = 0 x3−4x2+6x−5=0
are p,q,rp,q,rp,q,r. If
p3q4+r4+q3p4+r4+r3p4+q4=−ab \large \frac {p^3}{q^4+r^4} + \frac {q^3}{p^4+r^4} + \frac {r^3}{p^4+q^4} = - \frac {a}{b} q4+r4p3+p4+r4q3+p4+q4r3=−ba
for coprime positive integers a,ba,ba,b. What is the value of a−2ba-2ba−2b?
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