[tex]\frac{20}{63} - \frac{2}{9} =[/tex]
[tex]\frac{20}{63} - \frac{2}{9} = \frac{20}{63} - \frac{14}{63} = \frac{6}{63} = \frac{2} {21}[/tex]
20/63-2/9=
=20/63-14/63=
=6/63=2/21
