Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a1"   was replaced by   "a^1". 

Step  1  :

Equation at the end of step  1  :

  (2•7a19) • a

Step  2  :

Multiplying exponential expressions :

 2.1    a¹⁹ multiplied by a¹ = a^{(19 + 1)} = a²⁰

Final result :

  (2•7a20)