$x-22-\frac{x+2}{x^{2}-4}$
$6y-y+7$
$5x+11\:\ge20$
$\left(1+\tan\left(a\right)\right)\sec^2\left(a\right)=1$
$2-\left(3-2+5-1\right)+2\cdot\left(3-6\right)$
$2k+1=\left(2k+1\right)^2$
$\left(-5^3\right)^2$
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