You added $\displaystyle{\log{{2}}}\usepackage{cmbright}\Huge\$ to both sides of the equation, and then simplified $\displaystyle{\log{{16}}}+{\log{{2}}}\usepackage{cmbright}\Huge\$ to $\displaystyle{\log{{18}}}\usepackage{cmbright}\Huge\$ , instead of $\displaystyle{\log{{32}}}\usepackage{cmbright}\Huge\$ .