20 POINTS F ET G SEULEMENT

A = x - 5 - [x - (10 + 3x)]
A = x - 5 - (x - 10 - 3x)
A = x - 5 - x + 10 + 3x
A = x - x + 3x - 5 + 10
A = 3x + 5

B = 9 - (4x - 9) + (3x - 8)
B = 9 - 4x + 9 + 3x - 8
B = - 4x + 3x + 9 + 9 - 8
B = - x + 10

C = 3 (7x - 2) - 2 (7 - x) - 5x + 12
C = 21x - 6 - 14 + 2x - 5x + 12
C = 21x + 2x - 5x - 6 - 14 + 12
C = 18x - 8

D = 3x (2x - 2) - x [7x - 4 (x - 1)]
D = 6x² - 6x - x (7x - 4x + 4)
D = 6x² - 6x - 7x² + 4x² - 4x
D = 6x² - 7x² + 4x² - 6x - 4x
D = 3x² - 10x

E = (- 5x + 7) (3x - 4)
E = - 15x² + 20x + 21x - 28
E = - 15x² + 41x - 28

F = 2x (x² - x + 1) - 2 (x³ - 3x² - 4)
F = 2x³ - 2x² + 2x - 2x³ + 6x² + 8
F = 2x³ - 2x² - 2x² + 6x² + 2x + 8
F = 4x² + 2x + 8

G = 6 (3x - 2) (1 - 5x) - x (7x- 2)
G = 6 (3x - 15x² - 2 + 10x) - 7x² + 2x
G = 18x - 90x² - 12 + 60x - 7x² + 2x
G = - 90x² - 7x² + 18x + 60x + 2x - 12
G = - 97x² + 80x - 12

H = (x + 1) (x + 2) (x - 3)
H = (x² + 2x + x + 2) (x - 3)
H = x³ - 3x² + 2x² - 6x + x² - 3x + 2x - 6
H = x³ - 3x² + 2x² + x² - 6x - 3x + 2x - 6
H = x³ - 7x - 6

I = (x² + 2x - 1) (x² - 2x + 1)
I = x⁴ - 2x³ + x² + 2x³ - 4x² + 2x - x² + 2x - 1
I = x⁴ - 2x³+ 2x³ + x² - 4x² - x² + 2x + 2x - 1
I = x⁴ - 4x² + 4x - 1

J = 1/3x (6x - 2) - (8x - 1/2) (2x - 1/4)
J = 6/3x - 2/3x - (16x² - 8/4x - 2/2x + 1/8)
J = 6/3x - 2/3x - 16x² + 8/4x + 2/2x - 1/8
J = - 16x² + 6/3x + 8/4x + 2/2x - 2/3x - 1/8
J = - 16x² + 24/12x + 24/12x + 12/12x - 8/12x - 1/8
J = - 16x²  + 52/12x - 1/8