$$285X\frac{7}{8}$$
$\frac{1995X}{8}$
$$\frac{285\times 7}{8}X$$
$$\frac{1995}{8}X$$
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$\frac{1995}{8} = 249\frac{3}{8} = 249.375$
$$\frac{\mathrm{d}}{\mathrm{d}X}(\frac{285\times 7}{8}X)$$
$$\frac{\mathrm{d}}{\mathrm{d}X}(\frac{1995}{8}X)$$
$$\frac{1995}{8}X^{1-1}$$
$$\frac{1995}{8}X^{0}$$
$$\frac{1995}{8}\times 1$$
$$\frac{1995}{8}$$
