Respuesta :

Answer:

8

Explanation:

[tex]\frac{x}{x+3}=\frac{14}{21}\ \ \ \ \ \ \ \ \ \ 14-6=8[/tex]

[tex]21x=14x+42[/tex]

[tex]7x=42[/tex]

[tex]x=6[/tex]

I hope this helps you

:)