某书店出售一种挂历，每售出1本可得 18元利润。售出一部分后每本减价10元出售，全 部售完。已知减价出售这种挂历本数是原价出售挂历的2/3。书店售完这种挂历共获得利润2870元，书店一共出售这种挂历多少本？

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