bonjour
A = 8x + 3 - (6x + 2) = 8 x + 3 - 6 x - 2 = 2 x + 1
B = (9x + 5) + (- 2x + 3) = 9 x + 5 - 2 x + 3 = 7 x + 8
C = (4 * - 9) - (2x - 7) = 4 x - 9 - 2 x + 7 = 2 x - 2
D = (9x + 5)- 2x + 3 (4 x - 9)- 2x + 7 = 9 x + 5 - 2 x + 12 x - 27 - 2 x + 7
= 17 x - 15
F = (6x + 8)- (4x + 2) = 6 x + 8 - 4 x - 2 = 2 x + 6