$\sqrt{\frac{1}{1-x}}$
$\left(\frac{3}{7}x+2\right)\left(5-\sqrt{5}\right)$
$7a^2+5a-3=0$
$\:z=x^3+x^2y-y\:$
$12\cdot\frac{1}{3}x^2y^{-5}x^{-3}yx^{-1}y^3$
$\frac{x^2}{6-x}$
$\left(\frac{x+4}{\sqrt{x}-2}\right)\left(\frac{\sqrt{x+1}+1}{\sqrt{x+1}+1}\right)$
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