Solution - Simplification or other simple results

Step  1  :

            9
 Simplify   —
            5

Equation at the end of step  1  :

        7    9
  0 -  (— • (—)21))
        4    5

Step  2  :

 2.1     9 = 32

(9)²¹ = (3²)²¹ = 3⁴²

Equation at the end of step  2  :

        7   342
  0 -  (— • ———)
        4   521

Step  3  :

            7
 Simplify   —
            4

Equation at the end of step  3  :

        7   342
  0 -  (— • ———)
        4   521

Step  4  :

Equation at the end of step  4  :

        (7•342)
  0 -  ————————
       (22•521)

Step  5  :

Final result :

  ( -7•342)                                  
  ————————— = -4.01569 • 105 
  (22•521)