$\lim_{t\to\infty}\left(|x|\sqrt{1+\frac{1}{x}+\frac{1}{x^{2}}-x}\right)$
$9x^{2-16}$
$\left(l+9\right)\left(l-3\right)$
$\left(8\:-\:a\right)^2$
$4x-4=44$
$6x-2y=-10$
$\frac{x^2+7}{x^2-5x+6}$
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