$\left(4x^2+2x-6\right)$
$-486x-48$
$\frac{\left(m-n\right)^2-t^2}{\left(m-n\right)-t}$
$\frac{x^2-6x+4}{x-1}$
$\lim_{x\to\infty}\left(\frac{3800x}{x+5}\right)$
$\left(\frac{5x}{6}+\frac{1}{3}\right)\left(6\right)$
$\left(15x\right)^2-\left(15xy\right)-90y^2$
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