Bonjour,
A = 3(x + 6) + 2
A = 3x + 18 + 2
A = 3x + 20
B = 4 + 3(2y + 2)
B = 4 + 6y + 6
B = 10 + 6y
D = 9(x - 6) + 2x
D = 9x - 54 + 2x
D = 11x - 54
E = 3,5(2 - x) + 8,2
E = 7 - 3,5x + 8,2
E = 15,2 - 3,5x
F = 2(3 + 5x) + 8(7 - x) + 4(x - 1)
F = 6 + 10x + 56 - 8x + 4x - 4
F = 6x + 58