Explanation:
Dividing by a fraction is the same as multiplying by its reciprocal, so we can rewrite the expression as:
(-16/25)x^5*y^4*z^5 * (-15/8)(1/x^4)(1/y^3)(1/z^4)
Next, combine the values:
(240/200)(x^5/x^4)(y^4/y^3)(z^5/z^4)
When dividing variables with exponents, simply subtract the variable with the lower exponent from the one with the higher exponent (e.g. a^3/a^2 = a^(3-2) = a):
(6/5)xyz
(6xyz)/5 <— the simplified answer