Question 512218
john's age =x
camille's age = 3x-2

4 years later
John's age = x+4
Camille's age = 3x-2+4=> 3x+2

3x+2= 2(x+4)

3x+2=2x+8
3x-2x=8-2
x=6 => John's age

Camille's age = 3x-2 => 3*6-2
16 years