$\displaystyle-\frac{{1}}{{3}}\usepackage{cmbright}\Huge\$ , domain all x, not equal to $\displaystyle{x}={0}\usepackage{cmbright}\Huge\$ , $\displaystyle{x}=-{1}\usepackage{cmbright}\Huge\$ , and $\displaystyle{x}={3}\usepackage{cmbright}\Huge\$