5X-6≤2(X+3)5X-6≤2X+63X≤12x≤4..........................1X/4-1)<(X-3)/3(x-4)/4<(X-3)/33*(x-4)<4(x-3)3x-12<4x-123x-4x<0x>0。。。。。。。。。。。。2联立1,2得:0