$$\frac { 105 x ^ { 5 / 5 } } { 10 }$$
$\frac{21x}{2}$
$$\frac{105x^{1}}{10}$$
$$\frac{105x}{10}$$
$$\frac{21}{2}x$$
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$\frac{21}{2} = 10\frac{1}{2} = 10.5$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{105x^{1}}{10})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{105x}{10})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{21}{2}x)$$
$$\frac{21}{2}x^{1-1}$$
$$\frac{21}{2}x^{0}$$
$$\frac{21}{2}\times 1$$
$$\frac{21}{2}$$
