bonjour
g (x) = - 7 + 4 x
g ( - 9) = - 7 - 36 = - 43
- 7 + 4 x = - 9
4 x = - 9 + 7
4 x = - 2
x = - 2/4 = - 1/2
g ( - 1/2) = - 9
g ( 0) = - 7
- 7 + 4 x = 0
4 x = 7
x = 7/4
g ( 3) = - 7 + 12 = 5
- 7 + 4 x = 3
4 x = 10
x = 10/4 = 5/2
g ( 10/3) = - 7 + 40/3 = 19/3
- 7 + 4 x = 10/3
- 21/3 + 12 x /3 = 10/3
12 x = 10 + 21
12 x = 31
x = 31/12