[tex]a] \ 6-1\frac{3}{7}=5\frac{7}{7}-1\frac{3}{7}=4\frac{4}{7}\\\\b] \ 10-2\frac{3}{5}=9\frac{5}{5}-2\frac{3}{5}=7\frac{2}{5}\\\\c] \ 8-5\frac{5}{7}=7\frac{7}{7}-5\frac{5}{7}=2\frac{2}{7}[/tex]
