Remember:

If you multiply, add exponents

If you divide, subtract exponents

A variable with exponent 0 is always equal to 1.

14) (2 x) / (3 x^3) = 2 / (3 x^2) because x^0=1

16) 1/k because you simplify 3 k^2

18) (a^2)/2 because you simplify a^3

20) 1/(n^5) because n^0=1

22) x / (3 x^5) = 1/ (3 x^4)

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