Respuesta :

[tex]\stackrel{Fred}{\cfrac{\underline{2}}{3}}~~ - ~~\stackrel{Mary}{\cfrac{1}{2}}\implies \cfrac{(2)\underline{2}~~ - ~~(3)1}{\underset{\textit{using this LCD}}{6}}\implies \cfrac{4-3}{6}\implies \cfrac{1}{6}[/tex]