The expression
$\displaystyle {\frac{{{\left({x}^{{4}}{y}^{{4}}\right)}^{{4}}{\left({x}{y}^{{4}}\right)}^{{-{4}}}}}{{{x}^{{4}}{y}^{{3}}}}}$

equals $\displaystyle \frac{{x}^{{{e}}}}{{y}^{{{d}}}}$ where
the exponent $\displaystyle {e}$ of $\displaystyle {x}$ is , the exponent $\displaystyle {d}$ of $\displaystyle {y}$ is .