$$\frac{y}{3}-\frac{y}{5}+\frac{y}{10}$$
$\frac{7y}{30}$
$$\frac{2}{15}y+\frac{y}{10}$$
$$\frac{7}{30}y$$
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$\frac{7}{30} = 0.23333333333333334$
$$\frac{\mathrm{d}}{\mathrm{d}y}(\frac{2}{15}y+\frac{y}{10})$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(\frac{7}{30}y)$$
$$\frac{7}{30}y^{1-1}$$
$$\frac{7}{30}y^{0}$$
$$\frac{7}{30}\times 1$$
$$\frac{7}{30}$$
