$$3 x ^ { 2 } - 5 x + 3 + 6 - 3 x ^ { 2 }$$
$9-5x$
$$3x^{2}-5x+9-3x^{2}$$
$$-5x+9$$
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$-5$
$$\frac{\mathrm{d}}{\mathrm{d}x}(3x^{2}-5x+9-3x^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(-5x+9)$$
$$-5x^{1-1}$$
$$-5x^{0}$$
$$-5$$
