Solution - Simplification or other simple results

Step  1  :

            15
 Simplify   ——
            2 

Equation at the end of step  1  :

  81    15
  —— -  ——
  6     2 

Step  2  :

            27
 Simplify   ——
            2 

Equation at the end of step  2  :

  27    15
  —— -  ——
  2     2 

Step  3  :

Adding fractions which have a common denominator :

 3.1       Adding fractions which have a common denominator
Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

 27 - (15)     6
 —————————  =  —
     2         1

Final result :

  6