bonjour
A = 2 ( a + b )
B = 4 (c + 3 )
C = 2 ( 1 - 3 d)
D = e ( 5 e - 3 )
E = 5 ( x² - 1 )
F = f ( 1 - 4 f)
G = x² ( x - 3 )
H = 3 ( 3 a² - 2 a + 4 )