If the roots of x3−3x2+5x−7=0x^3 - 3x^2 + 5x - 7 = 0x3−3x2+5x−7=0 are α,β,γ\alpha, \beta, \gammaα,β,γ, find the value of 1α+1β+1γ\frac{1}{\alpha} + \frac{1}{\beta} + \frac{1}{\gamma}α1+β1+γ1.
3/73/73/7
5/75/75/7
−5/7-5/7−5/7
7/57/57/5