i cant work out why my answer is wrong, and not what the solutions say. could someone please help me with this question

**if y = xloge x/3 - x, find dy/dx**

first problem is, i cant work out if the question means xloge(x/3) - x or xloge(x/3 - x)

i did it as though it was the former. and i think the solutions did too, except i cant really follow what they've done. anyway can someone explain the answer to that please