[tex] - \frac{1}{6} + \frac{2}{3} (9 - \frac{3}{4} ) - \frac{1}{2} = [/tex]
[tex] - \frac{1}{6} + \frac{2}{3} \times \frac{33}{4} - \frac{1}{2} = [/tex]
[tex] - \frac{1}{6} + \frac{11}{2} - \frac{1}{2} = [/tex]
[tex]\frac{ - 1 +33 - 3 }{6} = \frac{29}{6} [/tex]
So, the answer is
[tex] \frac{29}{6} [/tex]
or 4,83.
