Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "a2"   was replaced by   "a^2". 

Step  1  :

Equation at the end of step  1  :

  7a253 • a28

Step  2  :

Multiplying exponential expressions :

 2.1    a²⁵³ multiplied by a²⁸ = a^{(253 + 28)} = a²⁸¹

Final result :

  7a281