$49a^{10}-225b^4$
$64^{64}$
$\lim_{x\to-2}\left(\frac{x^2+5x+6}{x+4}\right)$
$-120=-8\left(2r+1\right)$
$x^2+3x+21=22$
$\sqrt{\frac{-x^2}{2}}$
$9\left(x^2+6\right)$
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