Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "2.1" was replaced by "(21/10)". 2 more similar replacement(s)

Step  1  :

            21
 Simplify   ——
            10

Equation at the end of step  1  :

  15   21
  —— • ——
  10   10

Step  2  :

            3
 Simplify   —
            2

Equation at the end of step  2  :

  3   21
  — • ——
  2   10

Step  3  :

Final result :

  63           
  —— = 3.15000 
  20