$\lim_{x\to5}\left(\frac{\sqrt{5}-\sqrt{x}}{-x^2+25}\right)$
$2x+5>4$
$\left(-32x^2+5x-5\right)+\left(18x^2-3x-5\right)$
$3^3-5^2+14x$
$\frac{2\sqrt{x}-3\sqrt{y}}{-3\sqrt{x}-3\sqrt{y}}$
$7m+8=71$
$\frac{2ab}{10a^{2}b^{2}}$
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