$$3x-4x+10-10$$
$-x$
$$-x+10-10$$
$$-x$$
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$-1$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-x+10-10)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-x)$$
$$-x^{1-1}$$
$$-x^{0}$$
$$-1$$