Question 1208146
#2, not a complete solution...


Starts as  {{{((5x^(-2))/(6y^(-2)))^(-3)}}}


and then {{{((5(1/x^2))/(6(1/y^2)))^(-3)}}}

.

.

{{{((6x^2)/(5y^2))^3}}}
and still another step to go.