Réponse:
Programme A (x+2)-5
Programme B (x-6) *3
1) Programme A (-4-+2)-5 = -2-5=-7
Programme B (-4-6)*3 =-10*3 = -30
2) x+2-5= (x-6)*3
x= 3x -18 -2+5
x-3x = -15
-2x = -15
x= 15/2
x = 7.5
3)
programme 1 => ( 7.5 +2) -5 = 4.5
programme 2 => (7.5-6) * 3 = 1.5* 3 = 4.5