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Bonjour

1)

A = 3 (4x - 2)

A = 12x - 6

B = 5 (4 + 3x)

B = 20 + 15x

C = 2x (x - 4)

C = 2x² - 8x.

2)

D = 3 + (4x - 2)

D = 3 + 4x - 2

D = 4x + 1

E = 2x - (6 + 3x)

E = 2x - 6 - 3x

E = - x - 6

F = (3x + 5) - (2x - 1)

F = 3x + 5 - 2x + 1

F = x + 6

G = - (x + 7) + (4x - 2)

G = - x - 7 + 4x - 2

G = 3x - 9

3)

H = - 3 (8x - 4)

H = - 24x + 12

I = 2 (x + 9) - (4x - 1)

I = 2x + 18 - 4x + 1

I = - 2x + 19

J = (5x + 4) - (6x - 8) + 4 (2 - 3x)

J = 5x + 4 - 6x + 8 + 8 - 12x

J = 5x - 6x - 12x + 4 + 8 + 8

J = - 13x + 20.