Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  ((28) • (34)) • 52

Step  2  :

Equation at the end of step  2  :

  ((28) • 34) • 52

Step  3  :

Equation at the end of step  3  :

  (28 • 34) • 52

Step  4  :

Final result :

  (28•34•52)