（x-1）/2 > x,(x-1)/2 - x > 0,(x-1-2x)/2 >0,-x-1 >0
ax-6 > 5x,(a-5)x-6 > 0,(a-5)x/6 -1 > 0
-x-1 >0与(a-5)x/6 -1 > 0通解,所以(a-5)/6=-1,a-5=-6,a=-1
a=-1