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(- 2[tex]\frac{3}{4}[/tex] + 1[tex]\frac{1}{6}[/tex] ) + ( -1 [tex]\frac{2}{3}[/tex] + 2\frac{7}{12} ) = ( - \frac{11}{4} + \frac{7}{6} ) + ( -\frac{5}{3} + \frac{31}{12}) = \frac{14+31-33-20}{12} = \frac{14-22}{12} = -\frac{8}{12} = - \frac{2}{3}