$$6 x : 9 x$$
$\frac{2x^{2}}{3}$
$$\frac{2}{3}xx$$
$$\frac{2}{3}x^{2}$$
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$\frac{4x}{3}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{2}{3}xx)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{2}{3}x^{2})$$
$$2\times \frac{2}{3}x^{2-1}$$
$$\frac{4}{3}x^{2-1}$$
$$\frac{4}{3}x^{1}$$
$$\frac{4}{3}x$$
