6(2x-4)-3(3x+5)-(3x+6)=12x-24-9x-15-3x-6=-24-15-6=-45
6(2х-4)-3(3х+5)-(3х+6)=
= 12х+24-9х+9-3х+6=
=3х+24-9х+9-3х+6=
=24-9х-9+6=
=21-9х
6(2x-4)-3(3x+5)-(3x+6)=12x-24-9x-15-3x-6=-24-15-6=-45
6(2х-4)-3(3х+5)-(3х+6)=
= 12х+24-9х+9-3х+6=
=3х+24-9х+9-3х+6=
=24-9х-9+6=
=21-9х