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设调价前碳酸饮料每瓶x元,则果汁饮料每瓶7-x元,依题意3x(1+10%)+2(7-x)(1-5%)=17.5,两边都乘以10,得33x+7*19-19x=175,14x=7*6,x=3,7-x=4.