Incorrect. Use the power property ( $\displaystyle{a}\cdot{\log{{M}}}={{\log{{M}}}}^{{a}}\usepackage{cmbright}\Huge\$ ), the product property ( $\displaystyle{\log{{M}}}{N}={\log{{M}}}+{\log{{N}}}\usepackage{cmbright}\Huge\$ ), and the quotient property ( $\displaystyle{\log{{\left(\frac{{M}}{{N}}\right)}}}={\log{{M}}}-{\log{{N}}}\usepackage{cmbright}\Huge\$ ), to combine logarithms. Once you have $\displaystyle{\log{{M}}}={\log{{x}}}\usepackage{cmbright}\Huge\$ , you can then say that $\displaystyle{M}={x}\usepackage{cmbright}\Huge\$ .