Kevin ran 4 miles more than Steve ran. The sum of their distances is 26 miles. How far did Steve run

Kevin ran 4 miles more than Steve ran. The sum of their distances is 26 miles. How far did Steve run? The domain of the solution is:

Let k be Kevin's miles ran
Let s be Steve's miles ran

We have 2 given equtaions:

1. k = s + 4
2. k + s = 26

Substitute (1) into (2)
(s + 4) + s = 26
2s + 4 = 26

Plug this into our equation calculator and we get s = 11