( 2 1/8 + 3/4 )-( 3*4 2/3)=

[tex](2 \frac{1}{8} + \frac{3}{4} ) - (3 \times 4 \frac{2}{3} ) \\ = ( \frac{17}{8} + \frac{3}{4} ) - (3 \times \frac{14}{3} ) \\ = ( \frac{17 + 6}{8} ) - (14) \\ = \frac{23}{8} - \frac{112}{8} \\ = \frac{ - 89}{8} = - 11 \frac{1}{8} [/tex]