To solve the first inequality, add 5 to both sides and then divide by $\displaystyle-{3}\usepackage{cmbright}\Huge\$ . This will reverse the inequality sign and give you $\displaystyle{b}<{1}\usepackage{cmbright}\Huge\$ . To solve the second inequality, add 4 to both sides to get $\displaystyle{b}\le{4}\usepackage{cmbright}\Huge\$ .