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 21 and it always will be. 
β–² β–Ό
 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.  
β–² β–Ό
 GEMS or PEMDAS.  
β–² β–Ό
 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 
β–² β–Ό
 why the heck are you doing base-8 math? Are you a masocist? 
β–² β–Ό
 why the heck are you doing base-8 math? Are you a masocist? nostr.fmt.wiz.biz