$-11-19-28$
$4-6x^2$
$\lim_{x\to9}\left(\frac{\sqrt{x}-3}{x^2-81}\right)$
$xy+2x+4x^2=5$
$\left(25x^2-10\right)^2$
$x^2-42x+49=0$
$\left(-17\right)-\left(-21\right)-\left(-8\right)+\left(-54\right)-\left(96\right)$
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