Combining the results from the integration of both terms, we have:
\[
\int \left(5 x^{6} + 2 x^{4}\right) \, dx = \frac{5}{7} x^{7} + \frac{2}{5} x^{5} + C
\]
Final Answer
Thus, the complete solution to the integral is:
\[
\boxed{\frac{5}{7} x^{7} + \frac{2}{5} x^{5} + C}
\]