[tex]\displaystyle\\\frac{21^{\backslash 7}}{35}=\frac{21\div7}{35\div7}=\boxed{\bf\frac{3}{5}}\\\\\frac{^{2/}3}{5}=\frac{3\times 2}{5\times 2}=\frac{6}{10} =\boxed{\bf 0.6}[/tex]
