\[\frac{\left( x^{3} \right)^{5} \cdot \left( x^{14} \right)^{3}\ :x^{45}}{x^{0} \cdot x^{5} \cdot x^{6}} =\]
\[= \frac{x^{15} \cdot x^{42}}{x^{11} \cdot x^{45}} = \frac{x^{57}}{x^{56}} = x.\]