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µû¶ó¼ ¹®Á¦¿¡ ÁÖ¾îÁø ¼ö¿ä°î¼± D = 200 - 10Px¸¦ ¾Æ·¡¿Í °°ÀÌ Á¤¸®Çϸé
D = 200 - 10Px
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-> Px = -1/10D + 20
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