bonjour
Soukeyna = x
Agnès = x - 3
Xander = 2 ( x - 3 ) = 2 x - 6
x + x - 3 + 2 x - 6 = 107
4 x = 107 + 3 + 6
4 x = 116
x = 29
Soukeyna a 29 ans, Agnès 26 et Xander 52
