#(x-1)/(x-2) -(x-5)/(x-6)=(x-3)/(x-4)-(x-7)/(x-8)#
#=>(x-2+1)/(x-2) -(x-6+1)/(x-6)=(x-4+1)/(x-4)-(x-8+1)/(x-8)#
#=>1+1/(x-2) -1-1/(x-6)=1+1/(x-4)-1-1/(x-8)#
#=>1/(x-2) -1/(x-6)=1/(x-4)-1/(x-8)#
#=>(x-6-x+2)/((x-2)(x-6))=(x-8-x+4)/((x-4)(x-8))#
#=>-4/((x-2)(x-6))=-4/((x-4)(x-8))#
#=>(x-2)(x-6)=(x-4)(x-8)#
#=>x^2-8x+12=x^2-12x+32#
#=>12x-8x=32-12=20#
#=>4x=20#
#=>x=20/4=5#