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 )
