5084 - ( к - 299) = 568
к - 299 = 5084 - 568
к - 299 = 4516
к = 4516 + 299
к = 4815
Ответ: к = 4815
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Проверка:
5084 - ( 4815 - 299) = 568
1) 4815 - 299 =4516
2) 5084 - 4516 =568