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Ответ

Автор - saselya

Ответ:

3)x=5.2

Пошаговое объяснение:

3)4-0.5(x+9)=-2.1

0.5*x+9=-2.1-4

0.5*x+9=-6.1

x+9=-6.1/0.5

x+9=14.2

x=14.2-9

x=5.2

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