Simplify exponential expression

Simplify this expression and write answer without fraction: $$\frac{105(x^{-2}y^{-4})^{-2}}{3(x^3)^{-2}(y^7)^{-3}}$$

$$\frac{105(x^{-2}y^{-4})^{-2}}{3(x^3)^{-2}(y^7)^{-3}}=\frac{105x^{4}y^{8}}{3x^{-6}y^{-21}}=35x^{10}y^{29}$$