8х(3+2х)-(4х+3)(4х-3)=9х-6

24x+16x²-16x²-9=9x-6 24x-9x=-6+9 15x=3 x=0.2

8х(3+2х)-(4х+3)(4х-3)=9х-6. 24х+16х2-(16х2-9)-9х+6=0. 24x+16x2-16x2+9-9x+6=0. 15x=-15. x=-1.