bonjour, je galère en maths​

bonjour

3 x - 10 x + 7  = 4 x

- 7 x - 4 x = - 7

- 11 x = - 7

x =  7/11

g (x) =  x /3 + 2

x /3 + 2 =  4

x /3  = 12/3 - 6 /3

x =  6

f (x) = 5 x - 12

5 x - 12 = 0

5 x = 12

x = 12/5