Divide both sides of the first inequality to get $\displaystyle{m}\le-{6}\usepackage{cmbright}\Huge\$ . Subtract 24 from both sides of the second inequality to get $\displaystyle{m}>-{4}\usepackage{cmbright}\Huge\$ . Since the graphs of $\displaystyle{m}\le-{6}\usepackage{cmbright}\Huge\$ and $\displaystyle{m}>-{4}\usepackage{cmbright}\Huge\$ have no overlap, there is no solution.