Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "t8"   was replaced by   "t^8". 

Step  1  :

Equation at the end of step  1  :

  3t8 • t

Step  2  :

Multiplying exponential expressions :

 2.1    t⁸ multiplied by t¹ = t^{(8 + 1)} = t⁹

Final result :

  3t9