Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  ((((3•(m2))•(n2))-4mn)-5mn)+2m2n2
 Step  2  :

Equation at the end of step  2  :

  (((3m2 • n2) -  4mn) -  5mn) +  2m2n2

Step  3  :

Step  4  :

Pulling out like terms :

 4.1     Pull out like factors :

   5m²n² - 9mn  =   mn • (5mn - 9) 

Final result :

  mn • (5mn - 9)