5304 - неизвестное (искомое) число.
Пошаговое объяснение:Пусть 
- неизвестное (искомое) число.
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Пошаговое объяснение:
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ответ: 5304
Пошаговое объяснение:
обозначим х - за искомое число, тогда
(х-2496):9=312
х-2496=312*9
х-2496=2808
х=2808+2496
х=5304
Проверка:
(5304-2496):9=312
2808:9=312
312=312 Верно!