$$( x - 1 ) ^ { 2 } - 2 ( x - 3 )$$
$x^{2}-4x+7$
$$x^{2}-2x+1-2\left(x-3\right)$$
$$x^{2}-2x+1-2x+6$$
$$x^{2}-4x+1+6$$
$$x^{2}-4x+7$$
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