$\lim_{x\to0}\left(\frac{\sqrt{1+5x}-\sqrt{1-9x}}{x}\right)$
$\left(7mn-4m^2n\right)^2$
$64^3:4^4$
$\frac{4x^3-40x^2-12x+10}{x-2}$
$9\left(x+y\right)^2$
$169-26x^2$
$2x^2-3=5$
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