a/(a-b)=2
a=2a-2b
a=2b
(a^3-4a^3b)/(b^3-6ab^2)
=[(2b)^3-4*(2b)^3*b]/[b^3-6*(2b)*b^2]
=(8b^3-32b^4)/(b^3-12b^3)
=(32b-8)/11
=32b/11-8/11
a/(a-b)=2
a=2a-2b
a=2b
(a^3-4a^3b)/(b^3-6ab^2)
=[(2b)^3-4*(2b)^3*b]/[b^3-6*(2b)*b^2]
=(8b^3-32b^4)/(b^3-12b^3)
=(32b-8)/11
=32b/11-8/11