$-\left(-417\:-\:78\right)\:-\:\left(-518\:-\:287\right)$
$\sec\left(30\right)=\frac{1}{\cos\left(30\right)}$
$6\left(2+4\right)-1$
$x+7\ge0$
$\frac{x^2-2x-3}{x+2}$
$x^2+2<1-2x$
$-20:1+2$
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