Question 257829
{{{(-15xy^-2z^-3)/(-20x^6y^-2)}}}


so we get


{{{3/(4*(x^5)* (z^3))}}}
because {{{(-15)/(-20)=3/4}}}
{{{x/x^6=1/x^5}}}
{{{y^-2/y^-2=1}}}
{{{z^-3=1/z^3}}}