Répondre :
Bonjour,
A=
11 +2x -12 -3x +6=
-x +5
B=
2x+3x -5 -21 +12x=
17x -26
A = 11 + 2(x-6)-(3x-6)
= 11+ 2x -12 -3x+6
= 5 - x
B = 2x + (3x - 5) - 3(7 - 4x)
= 2x + 3x - 5 - 21 + 12x
= 17x - 26
= 11+ 2x -12 -3x+6
= 5 - x
B = 2x + (3x - 5) - 3(7 - 4x)
= 2x + 3x - 5 - 21 + 12x
= 17x - 26