Предмет: Математика, автор: ainizausonbekova2008

10 балов пожалуйста помогите с математикой)
(Число является корнем уравнения?)​

Приложения:

Ответы

Автор ответа: tvoytsekhovskaya11
1

Правильный ответ "с"

3х+21=19

3·(-2/3)+21=19

-2+21=19

19=19

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