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Let a,b in R and alpha^2-a alpha + b = 0...

Let `a,b in R and alpha^2-a alpha + b = 0; b beta^2 + a beta + 1 = 0; (2 b + a != 0, alpha beta+1 != 0),,` then the value of `(beta(alpha+a)-1)/(beta(alpha+b)-1-alpha` is -

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