[tex]\left(-\frac{3}{2}\right)-\left(-\frac{9}{4}\right)-\left(\frac{7}{6}\right)=-\frac{3}{2}+\frac{9}{4}-\frac{7}{6}==-\frac{18}{12}+\frac{27}{12}-\frac{14}{12}==-\frac{5}{12}[/tex]
