$$X^{2}m-4X+9$$
$2\left(Xm-2\right)$
$$2mX^{2-1}-4X^{1-1}$$
$$2mX^{1}-4X^{1-1}$$
$$2mX^{1}-4X^{0}$$
$$2mX-4X^{0}$$
$$2mX-4$$
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$mX^{2}-4X+9$