bonjour
A = 6 x - 4 - 2 x + 8
= 4 x + 4
B = 12 x² - 48 x - 8 x + 32
= 12 x² - 56 x + 32
C = 6 x - 4 + 2 x - 8
= 8 x + 12
D = 6 x - 8 x + 32
= - 2 x + 32
