bonjour
A = -4x² + 2x+6x = -4x² + 8x
B = 4x+4x -3-5 = 8x-8
C = 2x+4x +12x = 18x
D = -6x +20x + 7x = 21x
E = 2x+2x-2x - 5 - 5 - 3 = 2x -13
F= 9x+4x-5x - 4-7-1 = 8x - 12