[tex]\bf \begin{array}{|cc|ll} \cline{1-2} \cfrac{3\cdot 2}{7\cdot 2}&\implies \cfrac{6}{14}~~\bigotimes\\&\\ \cfrac{3\cdot 3}{7\cdot 3}&\implies \cfrac{9}{21}~~\bigotimes\\&\\ \cfrac{3\cdot 4}{7\cdot 4}&\implies \cfrac{12}{28}~~\bigotimes\\&\\ \cfrac{3\cdot 5}{7\cdot 5}&\implies \cfrac{15}{35}~~\bigotimes\\&\\ \cfrac{3\cdot 6}{7\cdot 6}&\implies \cfrac{18}{42}~~\bigotimes\\&\\ \cfrac{3\cdot 7}{7\cdot 7}&\implies \cfrac{21}{49}~~\textit{\Large \checkmark}\\ &\\ \cline{1-2} \end{array}[/tex]
