Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "x4"   was replaced by   "x^4". 

Step  1  :

Multiplying exponential expressions :

 1.1    x²¹³ multiplied by x⁴² = x^{(213 + 42)} = x²⁵⁵

Final result :

  x255