This is an example of the identity property of 0. The identity property of 1 states that $\displaystyle{x}{\left({1}\right)}={x}\usepackage{cmbright}\Huge\$ . The correct answer is: $\displaystyle{9}\frac{{2}}{{3}}{\left({1}\right)}={9}\frac{{2}}{{3}}\usepackage{cmbright}\Huge\$