Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a4"   was replaced by   "a^4". 

Step  1  :

Equation at the end of step  1  :

  (2•3a4) • a

Step  2  :

Multiplying exponential expressions :

 2.1    a⁴ multiplied by a¹ = a^{(4 + 1)} = a⁵

Final result :

  (2•3a5)