$$\frac{ 28 { a }^{ 4 } { b }^{ 4 } c }{ -7 { a }^{ 2 } { b }^{ 4 } c }$$
$-4a^{2}$
$$\frac{4a^{2}}{-1}$$
$$-4a^{2}$$
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$-8a$
$$\frac{\mathrm{d}}{\mathrm{d}a}(\frac{28cb^{4}}{-7cb^{4}}a^{4-2})$$
$$\frac{\mathrm{d}}{\mathrm{d}a}(-4a^{2})$$
$$2\left(-4\right)a^{2-1}$$
$$-8a^{1}$$
$$-8a$$
