For a box of products, the weight of each product is the same, and the weight of each product is more than 1. The weight of the box is not counted. The net weight of the product is 567 kg. After taking out several products, the net weight is 518 kg. What is the weight of a product in kilograms.
一箱产品，每个产品的重量都相同，且都是超过1的整千克数，箱子重量不计，产品净重567千克，拿出几个产品后净重518千克．一个产品的重量是多少千克．
<result>7</result>