$$10\frac{1}{q}+15\frac{1}{q}$$
$\frac{25}{q}$
$$\frac{10}{q}+15\times \frac{1}{q}$$
$$\frac{10}{q}+\frac{15}{q}$$
$$\frac{25}{q}$$
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$-\frac{25}{q^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}q}(\frac{10}{q}+15\times \frac{1}{q})$$
$$\frac{\mathrm{d}}{\mathrm{d}q}(\frac{10}{q}+\frac{15}{q})$$
$$\frac{\mathrm{d}}{\mathrm{d}q}(\frac{25}{q})$$
$$-25q^{-1-1}$$
$$-25q^{-2}$$
