Je comprends Rien !! au secours !

J = 2 (x - 6)
J = 2x - 12

K = 9 (8x - 3)
K = 72x - 27

L = 5 (9x + 2)
L = 45x + 10

M = 5 (8x + 9)
M = 40x + 45

N = 5 (7x - 10)
N = 35x - 50

P = 3 (2x - 7)
P = 6x - 21

Q = 9 (6x - 9)
Q = 54x - 81

R = 5 (2x - 1)
R = 10x - 5

S = 3 (9x - 2)
S = 27x - 6

T = 4 (8z - 2b)
T = 32z - 8b

U = 2 (5b + 3n)
U = 10b + 6n

V = 4 (5k + 5p)
V = 20k + 20p

W = 8 (2p - s)
W = 16p - 8s

Z = 8 (v - 3c)
Z = 8v - 24c