Respuesta :

Mistake #1: 1/2x was added; it should have been subtracted to get 5.5x
Mistake #2: 5/4 + 5 (20/4) is 25/4, which is 6.25 and not 3.75.
You should get 5.5x = 6.25, and x = 1.36. (not 15/26)