Solution - Simplification or other simple results

Step  1  :

            5
 Simplify   —
            1

Equation at the end of step  1  :

  99    
  —— -  5
  11    

Step  2  :

            9
 Simplify   —
            1

Equation at the end of step  2  :

  9 -  5

Step  3  :

Final result :

  4