Change the following logarithmic expressions.
\log_2\left(3x\right)-\log_2\left(6x\right)
\log_3\left(9x^{2}\right)-\log_3\left(3x^{2}\right)
\log_5\left(\sqrt[3]{625 m^{2}}\right)-\log_5\left(\sqrt[3]{25 m^{2}}\right)
\ln\left(x^{2}\right)-\ln\left(ex^{2}\right)
\log_2\left(\dfrac{8}{7}\right)
\ln\left(\dfrac{3}{e^{2}}\right)
\log\left(\dfrac{\sqrt[4]{100}}{7}\right)