$$3(0)-y=$$
$-y$
$$0-y$$
$$-y$$
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$-1$
$$\frac{\mathrm{d}}{\mathrm{d}y}(0-y)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(-y)$$
$$-y^{1-1}$$
$$-y^{0}$$
$$-1$$
