$-617-\left(+352\right)-\left(-323\right)-\left(-839\right)+\left(+372\right)$
$\frac{x}{3}+2=-1$
$\frac{2}{3}x<1$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{\pi}{2}-x\right)\left(tanx\right)$
$3x-2=5x+4$
$\lim_{x\to1.57}\left(\frac{-5cosx}{-14sin2x}\right)$
$\sin\left(x-15\right)=0.5$
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