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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