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Sagot :

Bonjour,

La prochaine fois merci d'écrire ton énoncé, ça fera gagner du temps et de l'énergie à celui qui répond !

a) 5x = - 55

x = - 55/5

x = - 11

b) x - 7 = 15

x = 15 + 7

x = 22

c) - x + 8 = - 9

- x = - 9 - 8

- x = - 17

x = 17

d) 3x + 5 = 7

3x = 7 - 5

3x = 2

x = 2/3

e) - 2x - 3 = 1

- 2x = 1 + 3

- 2x = 4

x = - 4/2

x = - 2

f) 5x - 8 = - 7

5x = - 7 + 8

5x = 1

x = 1/5

g) 2 + 3x = 14

3x = 14 - 2

3x = 12

x = 12/3

x = 4

h) 2x + 7 = 4

2x = 4 - 7

2x = - 3

x = - 3/2

i) 3 - 7x = 3

- 7x = 3 - 3

- 7x = 0

x = 0

j) 9 - 4x = 5

- 4x = 5 - 9

- 4x = - 4

x = 4/4

x = 1

k) - 8x + 3 = 11

- 8x = 11 - 3

- 8x = - 8

x = 8/8

x = 1

l) - 9x + 2 = - 3

- 9x = - 3 - 2

- 9x = - 5

x = 5/9

m) 1 - 5x = 4

- 5x = 4 - 1

- 5x = 3

x = - 3/5

n) 6x + 5 = - 3

6x = - 3 - 5

6x = - 8

x = - 8/6

x = - 4/3

o) - x - 9 = - 1

- x = - 1 + 9

- x = 8

x = - 8.

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