$-9-\left(-14\right)+\left(-19\right)$
$x^2-20x+19=0$
$x+4=28$
$0.5\cdot1.6$
$\lim_{x\to0}\left(\frac{8x^2}{\cos\left(x-2\right)}\right)$
$9\cdot\left(-5\right)^2$
$3-\left(-12\right)$
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