Sagot :

maudmarine

Bonjour,

7x + 6 = 69

7x = 69 - 6

7x = 63

x = 63/7

x = 9

- 7x - 6 = 8

- 7x = 8 + 6

- 7x = 14

x = - 14/7

x = - 2