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[tex]8-1\frac{4}{7}=7\frac{7}{7}-1\frac{4}{7}=6\frac{3}{7}\\\\9\frac{5}{7}-1\frac{4}{7}=8\frac{1}{7}\\\\11\frac{6}{7}-1\frac{4}{7}=10\frac{2}{7}\\\\18\frac{1}{7}-1\frac{4}{7}=17\frac{8}{7}-1\frac{4}{7}=16\frac{4}{7}\\\\20\frac{2}{7}-1\frac{4}{7}=19\frac{9}{7}-1\frac{4}{7}=18\frac{5}{7}\\\\33\frac{3}{7}-1\frac{4}{7}=32\frac{10}{7}-1\frac{4}{7}=31\frac{6}{7}[/tex]
