Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "^-1" was replaced by "^(-1)".

Step  1  :

 1.1     12 = 22•3

(12)^-1 = (2²•3)^(-1) = (2)^(-2) • (3)^(-1)

Equation at the end of step  1  :

  (72) • ((2)(-2)•(3)(-1))

Step  2  :

Equation at the end of step  2  :

  72 • ((2)(-2)•(3)(-1))

Step  3  :

Final result :

  49           
  —— = 4.08333 
  12