$\left(-50\right)-\left(-5\right)$
$4^2xy$
$x^2-4\ge2x+4$
$3x+\:2<-4$
$7\left(1+8y\right)$
$-2x-7+8x+3+z$
$\lim_{x\to1}\left(\frac{xlinx}{x^2-1}\right)$
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