$x^2+5x+7$
$398.6+14.085$
$\frac{1}{\sqrt{x+2}-2\sqrt{x+1}+\sqrt{x}}$
$x^2-3x-10>\:0$
$\frac{b^{-4}}{b^{-5}}$
$4x^2+4x-3$
$\left(-2+\frac{7}{3}x\right)^2$
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