$3x^2-8x-3$
$9a+7-9a+3$
$4x^2-100y^2$
$x^2-4x=96$
$20+90+519$
$\frac{3x^4+x+1}{x^2}$
$\lim_{n\to\infty}\left(\frac{1-\sqrt{2n}}{n}\right)$
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