Solution - Simplification or other simple results

Step  1  :

             1
 Simplify   ——
            21

Equation at the end of step  1  :

   1
  —— ÷ 4
  21

Step  2  :

          1      
 Divide  ——  by  4
         21      

Final result :

   1           
  —— = 0.01190 
  84