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A recent paper [I. Klebanov et al. \emph{Mod. Phys. Lett. B} \textbf{22}(2008) 3153; arXiv:0712.0433] claims that the exact solution of thePercus-Yevick (PY) integral equation for a system of hard spheres plus a steppotential is obtained. The aim of this paper is to show that Klebanov et al.'sresult is incompatible with the PY equation since it violates two known cases:the low-density limit and the hard-sphere limit.

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