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混合：200g 咖啡 R$ 30/kg + x g 咖啡 R$ 50/kg = 混合后 R$ 38/kg。求 x 。
混合：200g 咖啡 R$ 30/kg + x g 咖啡 R$ 50/kg = 混合后 R$ 38/kg。求 x 。
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