Ответы на вопрос:
х + 6 17/26 = 8 1/39
х + 6 51/78 = 8 2/78
х = 8 2/78 - 6 51/78
х = 7 80/78 - 6 51/78
х = 1 целая 29/78
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проверка: 1 29/78 + 6 17/26 = 1 29/78 + 6 51/78 = 7 80/78 = 8 2/78 = 8 1/39.
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