Verified answer

х = 1 целая 1/5 = 6/5

5х - 1 = 5 · 6/5 - 1 = 6 - 1 = 5

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х = 1 целая 1/5 = 1 целая 2/10 = 1,2

5х - 1 = 5 · 1,2 - 1 = 6 - 1 = 5

Ответ: 5.