Solution - Simplification or other simple results

Step  1  :

            17
 Simplify   ——
            21

Equation at the end of step  1  :

  38    17
  —— -  ——
  42    21

Step  2  :

            19
 Simplify   ——
            21

Equation at the end of step  2  :

  19    17
  —— -  ——
  21    21

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:

 19 - (17)      2
 —————————  =  ——
    21         21

Final result :

   2           
  —— = 0.09524 
  21