$$(54 { a }^{ 2 } { b }^{ 2 } { C }^{ 3 } ) \div (-6a { b }^{ 2 } { C }^{ 3 } )$$
$-9a$
$$\frac{9a}{-1}$$
$$-9a$$
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$-9$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{54b^{2}C^{3}}{-6b^{2}C^{3}}a^{2-1})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(-9a^{1})$$
$$-9a^{1-1}$$
$$-9a^{0}$$
$$-9$$
