Réponse :
A = 11 + 2(x - 6) + (- 3x -6)
= 11 + 2x -2 x 6 + (-3x) -6
= 11 + 2x - 12 - 3x -6
= x -7
B = -2x - ( -2 ) x 5 - 3 x 7 + 3 x 4x
= -2x + 10 - 21 + 12x
= 10x - 11
C = 8 + 2x - 5 x 2x + 5 x 6 + 4
= 8 + 2x - 10x + 30 + 4
= -8x + 34 + 8
= -8x + 42
D = -7x - 4 x 3x + 4 x 6 +3 +2 x 3x - 2 x 7
= -7x - 12x + 24 + 3 +6x - 14
= -13x + 27 -14
= -13x + 13
E = - 5x + 5x^2 - 5x x 3 - 7 x 6 + 7 x 8x
= -5x + 5x^2 - 15x - 42 + 56x
= 5x^2 -36x - 42