Solution - Simplification or other simple results

Step  1  :

 1.1     10 = 2•5

(10)⁷ = (2•5)⁷ = 2⁷ • 5⁷

Equation at the end of step  1  :

  345 • (27•57)

Step  2  :

Multiplying exponents :

 2.1    5¹  multiplied by  5⁷   = 5^{(1 + 7)} = 5⁸

Final result :

  (3•58•23•27)