Respuesta :

Answer:

Step-by-step explanation:

You can also do this without 3 variables if you find it easier:

 

1st part:  x

 

2nd part:  3x

 

3rd part: 9x

 

9x + 3x + x = 39

 

13x = 39  combine like terms

 

x = 3  divide by 13.

 

Plug in value of x to find other two parts