I am playing 
Star Wars Knights of the Old Republic II: The Sith Lords on the Xbox and I have come upon a mathematical problem that I need to solve to continue.
I need to solve this formula here:
(6_2)_8_9_1=13
The underscores require a -,+,/, or * operator.
Whoever solves this first wins 5k of my 
Niche Clicks 
Thanks!
 
