Question 166696
Your question :

 x^3  - 1/3 x ^3 + 5/6 x^3

 here all like terms are combined
   x^3 ( 1  - 1/3 + 5/6 )           x^3 is common , so taken out)
    x^3 [ (6 - 2 + 5 )6]            taking LCM of  1, 3,6 which is 6 & multiplying
       x^3 ( 11- 2 )/6 
         x^3 * 9 /6         or 9/6 *x^3