The result has the correct sign, but you multiplied the fractions instead of performing division. To divide, you need to multiply $\displaystyle-\frac{{7}}{{8}}\usepackage{cmbright}\Huge\$ by the reciprocal of $\displaystyle-\frac{{3}}{{4}}\usepackage{cmbright}\Huge\$ , or $\displaystyle-\frac{{4}}{{3}}\usepackage{cmbright}\Huge\$ . The correct answer is $\displaystyle\frac{{7}}{{6}}\usepackage{cmbright}\Huge\$ .