Question 5540
If an exponent is a negative number, it can be made positive by crossing the division line.

For example:{{{m^-2=1/m^2}}}
and {{{1/m^-6=m^6}}}

First create positive exponents:{{{r^-3}}} should be rewritten as {{{1/r^3}}} and {{{1/t^-2}}} should become {{{t^2}}}
Your new equation:
{{{s^5t^2t^2/r^3r^2s}}}

Combine like terms and look for cancellation opportunities:
{{{s^5t^4/r^5s}}}
{{{s^4t^4/r^5}}}