Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a7"   was replaced by   "a^7". 

Step  1  :

Equation at the end of step  1  :

  5a7 • a

Step  2  :

Multiplying exponential expressions :

 2.1    a⁷ multiplied by a¹ = a^{(7 + 1)} = a⁸

Final result :

  5a8