$$y2x^{2}-4x+1$$
$2\left(xy_{2}-2\right)$
$$2y_{2}x^{2-1}-4x^{1-1}$$
$$2y_{2}x^{1}-4x^{1-1}$$
$$2y_{2}x^{1}-4x^{0}$$
$$2y_{2}x-4x^{0}$$
$$2y_{2}x-4$$
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$1+y_{2}x^{2}-4x$