[tex] \frac{4}{7} - \frac{1}{8} + \frac{2}{7} - \frac{1}{16} = \\ \frac{4 + 2}{7} - \frac{1}{8} - \frac{1}{16} \\ \frac{6}{7} - \frac{1}{8} - \frac{1}{16} = \frac{96 - 14 - 7}{112} = \frac{75}{112} [/tex]