The solution of this inequality is $\displaystyle{t}<{5}\usepackage{cmbright}\Huge\$ , and the graph shows $\displaystyle{t}>{5}\usepackage{cmbright}\Huge\$ , so you may have forgotten to reverse the inequality sign when you divided by $\displaystyle-{3}\usepackage{cmbright}\Huge\$ . The correct answer is $\displaystyle{4}{t}-{4}>{16}\usepackage{cmbright}\Huge\$ .