Rewrite as a single logarithm.

5 logb m -6/5 logb n +1/3 logb j - 2 logb k

5 logb m -6/5 logb n +1/3 logb j - 2 logb k

= logb m^5 - logb n^(6/5) + logb j^(1/3) - logb k^2
= logb (m^4 j^(1/3)/(n^(6/5) k^2) )