$$3 \times ( { x }^{ 4 } ) \times 5x$$
$15x^{5}$
$$3x^{5}\times 5$$
$$15x^{5}$$
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$75x^{4}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3x^{5}\times 5)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(15x^{5})$$
$$5\times 15x^{5-1}$$
$$75x^{5-1}$$
$$75x^{4}$$
