Respuesta :

[tex]\bf \cfrac{\quad \frac{9}{y}\quad }{\frac{6}{y-7}}\implies \cfrac{9}{y}\cdot \cfrac{y-7}{6}\implies \cfrac{9}{6}\cdot \cfrac{y-7}{y}\implies \cfrac{3}{2}\cdot \cfrac{y-7}{y}\implies \cfrac{3y-21}{2y}[/tex]