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Ответ

Автор - 1666DemoN6661
486:(5х+2)=18
5х+2 = 486 : 18
5х+2 = 27
5х = 27-2
5х= 25
х = 25 : 5
х= 5
Проверка:
486 : (5*5 +2) = 18
486 : 27 = 18
18 = 18 

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