Réponse:

A = 3(x + 8) + 4 ( 7x + 2)

A = 3x + 24 + 28x + 8

A = 31x + 32

B = 5 ( x - 1 ) - 7x ( 2 + 3x )

B = 5x - 5 - 14x + 21x *2

B = -5 + 21x*2 - 9x

C = 2x (4 - 5x ) - ( x - 7 )

C = 8x -10x*2 - x + 7

C = 9x - 10x*2 + 7

D = ( 3 - 8x ) - 5 (4x - 7 )

D = 3 - 8x - 20x + 35

D = 38 - 28x

E = 7 ( 3 - 2x ) - 4x ( 2x - 1 )

E = 21 - 14x - 8x*2 + 4x

E = 21 - 10x - 8x*2

F = 7x - 5 ( 2 - 9x ) + 7 ( 9x - 1 )

F = 7x - 10 + 45x + 63x - 7

F = - 17 + 115x