$$-2y(3 { y }^{ 2 }$$
$-6y^{3}$
$$-2y^{3}\times 3$$
$$-6y^{3}$$
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$-18y^{2}$
$$\frac{\mathrm{d}}{\mathrm{d}y}(-2y^{3}\times 3)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(-6y^{3})$$
$$3\left(-6\right)y^{3-1}$$
$$-18y^{3-1}$$
$$-18y^{2}$$
