Bonsoir,
x-8-(2+4x-(9-5x))
= x-8-(2+4x-9+5x)
= x-8-2-4x+9-5x
= - 8x +7
Simplifier :
= x-8-(2+4x-(9-5x))
= x-8-(-7+9x)
= x-8+7-9x
= -8x-8+7
= -8x-1
Bonne soirée.
