Question 86418
Multiplying exponents.

{{{((-3x^2y^-3)^3(x^-3y^2))}}} [multiply exponents raised to another power]
{{{((-3^3)(x^(2*3))( y^(-3*3))(x^-3y^2))}}}
{{{((-27x^6y^-9)(x^-3y^2))}}}
.
{{{(-27(x^(6-3))(y^(-9+2)))}}} [to simply multiply exponents with like-bases, add the exponents]
.
{{{(-27x^3y^-7))}}}
{{{(-27x^3/y^7)}}} [to get rid of a negative exponent, flip the fraction]