$9\left(3n-5\right)$
$\lim_{x\to0}\left(\frac{x^2\:-1}{x+1}\right)$
$f ( x ) = 1 x$
$0.1x-22+0.4x-53$
$9x^4-36x^2y+36y^2$
$\sqrt{x\cdot\sqrt[4]{3x^2\cdot\sqrt[8]{x}}}$
$\frac{dy}{dx}+x^2\left(6\right)=5x^2$
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