6. Perform the indicated operation and simplify. (i) $(x^2 - 49) \cdot \frac{5x + 2}{x + 7}$ (iii) $\frac{x^6 - y^6}{x^2 - y^2} \div (x^4 + x^2y^2 + y^4)$ (ii) $\frac{4x - 12}{x^2 - 9} \div \frac{18 - 2x^2}{x^2 + 6x + 9}$ (iv) $\frac{(x^3 - y^3)(x^2 - 2xy + y^2)}{(x - y)(x^2 + xy + y^2)}$
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