bonjour
A = 3 * x + 6
B = - 5 * 2 x + ( - 5 * 7 )
C = 4 * x * x
D = 4 * x * 5 * - 2 * x
E = ( 4 + x ) ( 3 - 4 * x )
F = 2 * x * x + 4 * x - 5