Subtract 24 from both sides of the first inequality to get $\displaystyle-{6}{f{\le}}{36}\usepackage{cmbright}\Huge\$ . Then divide by $\displaystyle-{6}\usepackage{cmbright}\Huge\$ to find $\displaystyle{f{\ge}}-{6}\usepackage{cmbright}\Huge\$ . Add 14 to both sides of the second inequality to get $\displaystyle{f{\le}}-{8}\usepackage{cmbright}\Huge\$ . There is no overlap between the graphs of $\displaystyle{f{\ge}}-{6}\usepackage{cmbright}\Huge\$ and $\displaystyle{f{\le}}-{8}\usepackage{cmbright}\Huge\$ , so there is no solution.