Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "b7"   was replaced by   "b^7". 

Step  1  :

Multiplying exponential expressions :

 1.1    b²⁸ multiplied by b⁷ = b^{(28 + 7)} = b³⁵

Final result :

  b35