Solution - Simplification or other simple results

Step  1  :

            3
 Simplify   —
            5

Equation at the end of step  1  :

   7         2     3
  (— • (0 -  —)) • —
   4         5     5

Step  2  :

            2
 Simplify   —
            5

Equation at the end of step  2  :

   7         2     3
  (— • (0 -  —)) • —
   4         5     5

Step  3  :

            7
 Simplify   —
            4

Equation at the end of step  3  :

   7   -2    3
  (— • ——) • —
   4   5     5

Step  4  :

Final result :

  -21            
  ——— = -0.42000 
  50