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If $r_{1}, r_{2}, r_{3}, r_{4}$ are the roots of the equation $4x^{4}-3x^{3}-x^{2}+2x-6=0$, what is the value of $\frac{1}{r_{1}}+\frac{1}{r_{2}}+\frac{1}{r_{3}}+\frac{1}{r_4}$?

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