\lim_{x-1} \ \ \frac{1-x^{\frac{-2}{3}}}{1-x^{\frac{-1}{3}}}
If\, \, 2f\left ( x+1 \right )+f\left ( \frac{1}{x+1} \right )= 2x and x\neq -1, then f\left ( x \right ) is equal to
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