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If Sonia left $8u after spending $117 , she would in the end have $8u * 3/8 = 3u. But this 3u is 1/7 of her original money, so she had $ 3u * 7 = $21u at first. 

21u = 117 + 8u

13u = 117

u = 9

21u = 189

She had $189 at first. 

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