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MAUDMARINE

Bonjour

7x + 8 = 14x

7x - 14x = - 8

- 7x = - 8

x = 8/7

5x - 3 = 7 + 9x

5x - 9x = 7 + 3

- 4x = 10

x = - 10/4

x = - 5/2.

MARGESIMPSON1

Bonjour,

1. Résoudre :

7x + 8 = 14x

7x - 14x = -8

-7x = -8

-7x/-7 = -8/-7

x = 8/7

5x - 3 = 7 + 9x

5x - 3 + 3 = 7 + 9x + 3

5x = 7 + 9x + 3

5x = 10 + 9x

5x - 9x = 10

-4x = 10

-4x/-4 = 10/-4

x = -10/4 = -5/2

Cours proposé par l'équipe de Brainly/Nosdevoirs :

https://nosdevoirs.fr/devoir/1962172

/ = fraction

Bonne journée.

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