Bsr besoin d’aide svp Merci

Bonsoir

a)2n+(n-5)

=2n+n-5

=3n-5

b)8t-(5t+6)

=8t-5t-6

=3t-6

c)27-(-8-2x)

=27+8+2x

=35+2x

d)10y+2+(-y-7)

=10y+2-y-7

=9y-5

e)10-(m+3)+(3m²+6m)

=10-m-3+3m²+6m

=3m²+5m+7

f)x-8-[2+4x-(9-5x)

=x-8-[2+4x-9+5x]

=x-8-2-4x+9-5x

=-8x+7