$$5x \times 2x$$
$10x^{2}$
$$5x^{2}\times 2$$
$$10x^{2}$$
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$20x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(5x^{2}\times 2)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(10x^{2})$$
$$2\times 10x^{2-1}$$
$$20x^{2-1}$$
$$20x^{1}$$
$$20x$$
