$$\frac{-91}{49}X\frac{51}{72}$$
$-\frac{221X}{168}$
$$-\frac{13}{7}X\times \frac{51}{72}$$
$$-\frac{13}{7}X\times \frac{17}{24}$$
$$\frac{-13\times 17}{7\times 24}X$$
$$\frac{-221}{168}X$$
$$-\frac{221}{168}X$$
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$-\frac{221}{168} = -1\frac{53}{168} = -1.3154761904761905$
$$\frac{\mathrm{d}}{\mathrm{d}X}(-\frac{13}{7}X\times \frac{51}{72})$$
$$\frac{\mathrm{d}}{\mathrm{d}X}(-\frac{13}{7}X\times \frac{17}{24})$$
$$\frac{\mathrm{d}}{\mathrm{d}X}(\frac{-13\times 17}{7\times 24}X)$$
$$\frac{\mathrm{d}}{\mathrm{d}X}(\frac{-221}{168}X)$$
$$\frac{\mathrm{d}}{\mathrm{d}X}(-\frac{221}{168}X)$$
$$-\frac{221}{168}X^{1-1}$$
$$-\frac{221}{168}X^{0}$$
$$-\frac{221}{168}$$
