[tex] \frac{3}{7} \times 21 = \frac{3 \times 21}{7} = 3 \times 3 = 9[/tex]
[tex]\it \dfrac{3}{7}\ \ din\ \ 21\ =\ \dfrac{3}{7}\cdot21=\dfrac{\ 3\cdot21^{(7}}{7}=3\cdot3=9[/tex]
