$$6/9x2/3$$
$\frac{2x_{2}}{9}$
$$\frac{\frac{2}{3}x_{2}}{3}$$
$$\frac{2}{9}x_{2}$$
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$\frac{2}{9} = 0.2222222222222222$
$$\frac{\mathrm{d}}{\mathrm{d}x_{2}}(\frac{\frac{2}{3}x_{2}}{3})$$
$$\frac{\mathrm{d}}{\mathrm{d}x_{2}}(\frac{2}{9}x_{2})$$
$$\frac{2}{9}x_{2}^{1-1}$$
$$\frac{2}{9}x_{2}^{0}$$
$$\frac{2}{9}\times 1$$
$$\frac{2}{9}$$
