$$x/x-x-1/1-1/x+1$$
$-x+1-\frac{1}{x}$
$$1-x-\frac{1}{1}-\frac{1}{x}+1$$
$$1-x-1-\frac{1}{x}+1$$
$$-x-\frac{1}{x}+1$$
$$\frac{\left(-x+1\right)x}{x}-\frac{1}{x}$$
$$\frac{\left(-x+1\right)x-1}{x}$$
$$\frac{-x^{2}+x-1}{x}$$
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$-\frac{x^{2}-x+1}{x}$
