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Ответ дан
prettypushkova

122 : (17 + х) = 4

17 + х = 122 : 4

17 + х = 30,5

х = 30,5 - 17

х = 13,5

===========

Проверка: 122 : (17 + 13,5) = 4

                   122 : 30,5 = 4

                   4 = 4

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