Respuesta :
Just factor out
[tex]\\ \rm\hookrightarrow \dfrac{x^2-6x+9}{6x-18}[/tex]
[tex]\\ \rm\hookrightarrow \dfrac{x^2-3x-3x+9}{6(x-3)}[/tex]
[tex]\\ \rm\hookrightarrow \dfrac{x(x-3)-3(x-3)}{6(x-3)}[/tex]
[tex]\\ \rm\hookrightarrow \dfrac{(x-3)(x-3)}{6(x-3)}[/tex]
[tex]\\ \rm\hookrightarrow \dfrac{x-3}{6}[/tex]