Bonsoir,
a) 13 + (x - 6) = 13 + x - 6 = x + 7
b) -5 - (4 - 2x) = -5 - 4 + 2x = 2x - 9
c) 10 - (x + 3) + (-3x + 6) = 10 - x - 3 - 3x + 6 = -4x + 13
d) (5 + 2x) - (-7 - 7x) = 5 + 2x + 7 + 7x = 9x + 12
e) x - 8 - (2 + 4x - (9 - 5x)) = x - 8 - (2 + 4x - 9 + 5x)
= x - 8 - 2 - 4x + 9 - 5x = -8x - 1
Bonne soirée !
