$$9y-6z-9y+5z$$
$-z$
$$-6z+5z$$
$$-z$$
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$-1$
$$\frac{\mathrm{d}}{\mathrm{d}z}(-6z+5z)$$
$$\frac{\mathrm{d}}{\mathrm{d}z}(-z)$$
$$-z^{1-1}$$
$$-z^{0}$$
$$-1$$