bonjour
f (x) = 5 x + 2
f ( 3) = 3*5 + 2 = 17
f ( - 6) = - 6*5 + 2 = - 28
f ( 2/3) = 10/3 + 2 = 10/3 + 6 /3 = 16/3
5 x + 2 = 22
5 x = 22 - 2
5 x = 20
x = 4
5 x + 2 = - 28
5 x = - 28 - 2
5 x = - 30
x = - 6
5 x + 2 = - 2
5 x = - 2 - 2
5 x = - 4
x = - 4/5 = - 0.8
