[tex] \frac{x}{6} = \frac{5}{3} \\ [/tex]

[tex]3x = 5 \: . \: 6 \\ [/tex]

[tex]3x = 30 \\ [/tex]

[tex]x = \frac{30}{3} \\ [/tex]

[tex]\boxed{\boxed{\boxed{x = 10}}} \\ [/tex]