The sum of all the real roots of the equation \( (e^{2x} - 4)(6e^{2x} - 5e^{x} + 1) = 0 \) is:
\( \log_e 3 \)
\( -\log_e 3 \)
\( \log_e 6 \)
\( -\log_e 6 \)