$$+9 { x }^{ 2 } -9 { x }^{ 2 } -6 { x }^{ 2 }$$
$-12x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-6x^{2})$$
$$2\left(-6\right)x^{2-1}$$
$$-12x^{2-1}$$
$$-12x^{1}$$
$$-12x$$
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$-6x^{2}$
$$-6x^{2}$$