$$5 { x }^{ 3 } -4 { x }^{ 3 } - \frac{ 1 }{ 5 } { x }^{ 3 }$$
$\frac{4x^{3}}{5}$
$$x^{3}-\frac{1}{5}x^{3}$$
$$\frac{4}{5}x^{3}$$
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$\frac{12x^{2}}{5}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(x^{3}-\frac{1}{5}x^{3})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{4}{5}x^{3})$$
$$3\times \frac{4}{5}x^{3-1}$$
$$\frac{12}{5}x^{3-1}$$
$$\frac{12}{5}x^{2}$$
