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Sagot :

TEAMCE

Bonjour,

Résoudre les équations:

3x + 7 = 0

3x + 7 - 7 = 0 - 7

3x = -7

x = -7/3

7x - 11 = 4x - 10

7x - 11 + 11 = 4x - 10 + 11

7x = 4x + 1

7x - 4x = 4x + 1 - 4x

3x = 1

x = 1/3

9 - x = 7 + x

-x + 9 = x + 7

-x + 9 + x = x + 7 + x

9 = 2x + 7

9 - 7 = 2x + 7 - 7

2 = 2x

2x = 2

x = 2/2 = 1

2x + 5 = 3x + 9

2x + 5 - 9 = 3x + 9 - 9

2x - 4 = 3x

2x - 4 - 2x = 3x - 2x

-4 = x

x = -4

Bonne journée.

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