$x^2-196$
$\lim_{x\to0}\left(\frac{\sqrt{9-x^2}-3}{x}\right)$
$2x^2-18x+25$
$4\:=\:10\:-\:n$
$x^2+11x=24$
$\left(4b-1\right)^2$
$a^3-4$
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