Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "x7"   was replaced by   "x^7". 

Step  1  :

Multiplying exponential expressions :

 1.1    x²¹⁹ multiplied by x⁷⁸ = x^{(219 + 78)} = x²⁹⁷

Final result :

  x297