Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a9"   was replaced by   "a^9". 

Step  1  :

Equation at the end of step  1  :

  7a9 • a

Step  2  :

Multiplying exponential expressions :

 2.1    a⁹ multiplied by a¹ = a^{(9 + 1)} = a¹⁰

Final result :

  7a10