Respuesta :

17 - 4 = 13.


Your Welcome. :)
To solve for x we will do the following steps. Then we will check our work. Lets do it:- 

17 - x = 13
17 - 13 = x
17 - 13 = 4
x = 4

CHECK OUR WORK:-

17 - 4 = 13
We were RIGHT!!!

So, x = 4.

Hope I helped ya!!