Simplify the following expression ?

((-8x^3)/27)

Step-by-step explanation:

(3^-3x^-3/-2x^-6)

When the expression looks like this (x^n)^s  you multiply the exponents so

x^(n*s)

Work:

3^-3=(1/27)   -2^-3= (-1/8)

((1/27)x^(-3))/((-1/8)x^(-6))

Then when dividing you subtract the exponents: -3-(-6)=3

((-8x^3)/27)