Solution - Simplification or other simple results

Step  1  :

            2
 Simplify   —
            3

Equation at the end of step  1  :

         5         2
  0 -  ((— • (0 -  —)) • -18)
         3         3

Step  2  :

            5
 Simplify   —
            3

Equation at the end of step  2  :

         5   -2
  0 -  ((— • ——) • -18)
         3   3 

Step  3  :

Final result :

  -20