bonsoir
M = 6 /3 + 3 x = 2 + 3 x
N = 5 - 5 y
P = - 6 a/2 + 6/6 = - 3 a + 1
T = x +1 - 2 x + 3 = - x + 4
U = 3 x + 1 - 13 x + 1 = - 10 x + 2
5 - [ 4 - ( 3 a - 5 ) + ( a + 5 ) ]
= 5 - ( 4 - 3 a + 5 + a + 5 )
= 5 - ( - 2 a + 14 )
= 5 + 2 a - 14
= 2 a - 9
