You may have correctly simplified $\displaystyle{\log}_{{{2}}}{{32}}^{{x}}\usepackage{cmbright}\Huge\$ to $\displaystyle{x}{\log}_{{{2}}}{32}\usepackage{cmbright}\Huge\$ , but then incorrectly simplified $\displaystyle{\log}_{{2}}{32}\usepackage{cmbright}\Huge\$ . Use the definition of logarithm.