$\left(-100\right)-\left(-189\right)$
$5x-1+4x-1$
$100\:.\:9.878$
$14-\left|-10+3\right|$
$\left(12^{-5}\right)^{-1}$
$x+2x\sqrt{x-3}=0$
$-5e^{-4}+5e^{-0}$
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