You may not have reversed the inequality sign in the second inequality when dividing both sides by $\displaystyle-{6}\usepackage{cmbright}\Huge\$ . The two inequalities simplify to $\displaystyle{m}>{3}\usepackage{cmbright}\Huge\$ and $\displaystyle{m}>-{3}\usepackage{cmbright}\Huge\$ . The solution to this compound inequality is all numbers greater than 3.