Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "0.5" was replaced by "(5/10)".

Step  1  :

            1
 Simplify   —
            2

Equation at the end of step  1  :

  1
  —
  2

Step  2  :

                 1
 Divide  20  by  —
                 2

Final result :

  40