原式=3(5x-4)/(3x-9)-﹙6x+5﹚/﹙3x-9﹚=-1/3
(15x-12-6x-5)/3x-9=-1/3
(9x-17)/3x-9=-1/3
9-3x=27x-51
-3x-27x=-51-9
-30x=-60
x=2