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Ответ дан
prettypushkova

(5 1/3)х - 1 = 1 2/9

(16/3)х = 1 2/9 + 1

(16/3)х = 2 2/9

(16/3)х = 20/9

х = 20/9 : 16/3

х = 20/9 · 3/16

х = (5·1)/(3·4)

х = 5/12

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Проверка: 5 1/3 · 5/12 - 1 = 1 2/9

                   16/3 · 5/12 - 1 = 1 2/9

                   80/36 - 1 = 1 2/9

                   20/9 - 9/9 = 1 2/9

                   11/9 = 1 2/9 - верно

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