pair of linear equations in two variables, Mathematics

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a lending library has a fixed charge for the first three days and an additional charge for each day thereafter. sam paid Rs 27 for a bookkept for 7 days while jaan paid Rs 21 for the book she kept for 5 days. find the fixed charge and the charge for each extra day

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I don"t knoe yhe answer, 24x+7=3x+10

24x+7=3x+10

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