$-7\:+\:9\:\cdot\:-3\:+\:1$
$x\frac{dy}{dx}-2y=6$
$y=u^2-2u$
$3x+17<30$
$\sqrt{2.32}$
$\frac{27^{3n+6}}{27^{3n+6}}$
$\int_{-\infty\:}^{-1}\left(\frac{x}{x^2\:-1}\right)dx$
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