[tex]2\frac{1}{3} + 3\frac{1}{4} + (-1\frac{5}{6}) = \frac{7}{3} + \frac{13}{4} - \frac{11}{6} = \frac{28}{12} + \frac{39}{12} - \frac{22}{12} = \frac{45}{12} = \frac{15}{4} = 3\frac{3}{4}[/tex]
-42 + 85 + (-67) + 13 + 47 + (-81) = -45
