First, simplify the signs:
[tex]= - \frac{1}{2} + \frac{2}{3} - 1\frac{1}{6} [/tex]
Now change the mixed numeral into a fraction:
[tex]= - \frac{1}{2} + \frac{2}{3} - \frac{7}{6} [/tex]
Now change all fractions to the common denominator, 6:
[tex]= - \frac{3}{6} + \frac{4}{6} - \frac{7}{6} [/tex]
Now combine the fractions together:
[tex]= -\frac{6}{6}
-1