$$\frac{3}{4x^{2}}\frac{-3}{5x^{3}}Lcd=$$
$-\frac{9Lcd}{20x^{5}}$
$$\frac{3\left(-3\right)}{4x^{2}\times 5x^{3}}Lcd$$
$$\frac{3\left(-3\right)L}{4x^{2}\times 5x^{3}}cd$$
$$\frac{3\left(-3\right)Lc}{4x^{2}\times 5x^{3}}d$$
$$\frac{3\left(-3\right)Lcd}{4x^{2}\times 5x^{3}}$$
$$\frac{3\left(-3\right)Lcd}{4x^{5}\times 5}$$
$$\frac{-9Lcd}{4x^{5}\times 5}$$
$$\frac{-9Lcd}{20x^{5}}$$
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$\frac{9Lcd}{4x^{6}}$
