\[\frac{\left( 9x^{4} \right)^{5} \bullet (3x)^{3}}{\left( 27x^{5} \right)^{4}} = - 192\]
\[\frac{3^{10} \bullet 3^{3}x^{3}}{3^{12}} = - 192\]
\[\frac{3^{13}x^{3}}{3^{12}} = - 192\]
\[3x³ = - 192\ \ \ \ \ |\ :3\]
\[x^{3} = - 64\]
\[x = - 4.\]