4x-3\3-2x-4+5x\3+2x-3+x-10x^2\4x^2-9

((3+2х)(4х-3)-(3-2х)(4+5х))/(3-2х)(3+2х)-(3+х-10х^2)/4х^2-9=
(6х+8ч^2-9-12+8х-15х+10х^2)/9-4х^2-3+х-10х^2/4х^2-9=
(-х+18х^2-21)/9-4х^2-3+х-10х^2/4х^2-9=
(x-18x^2+21-3-x+10x^2)/4x^2-9=
(-8x^2+18)/4x^2-9=
-2(2x+3)(2x-3)/(2х+3)(2х-3)=-2