[tex]\\ \tt\longmapsto \dfrac{4x}{5+x}\div \dfrac{6x}{x+2}[/tex]
[tex]\\ \tt\longmapsto \dfrac{4x}{5+x}\times \dfrac{x+2}{x}[/tex]
[tex]\\ \tt\longmapsto 4x^2=x^2+7x+10[/tex]
[tex]\\ \tt\longmapsto 4x^2-x^2-7x-10=0[/tex]
[tex]\\ \tt\longmapsto 3x^2-7x-10=0[/tex]
