brackets next to a term means multiply, you only need to write a symbol for divide, add or subtract

this is just trolling 

 No 17 is the answer.  

 Ah, I thought it was parentheses first, then left to right. So it's all the multiplication first, then the addition. Been a long time.  

 GEMS or PEMDAS.  

 8-5 is 3 we do that first it leaves this

2+5*3=

Once we get there multiply/divide before add subtract

So then we end up with 

2+15= 17 

 Yep. 

 why the heck are you doing base-8 math? Are you a masocist?