$$\frac{ 5 }{ 4 { x }^{ 2 } } - \frac{ 3 }{ 5 { x }^{ 3 } }$$
$\frac{5}{4x^{2}}-\frac{3}{5x^{3}}$
$$\frac{5\times 5x}{20x^{3}}-\frac{3\times 4}{20x^{3}}$$
$$\frac{5\times 5x-3\times 4}{20x^{3}}$$
$$\frac{25x-12}{20x^{3}}$$
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$\frac{25x-12}{20x^{3}}$