$\left(9\cdot10^9\right)\left(3\cdot10^{-6}\right)\left(-8\cdot10^{-6}\right)$
$2x+3\ge5$
$7x+30\ge-40$
$-\left(-\:1\:-\:5\:+\:6\right)\:+\:\left(-9\:+\:6\right)\:=\:$
$w^2-11w+13$
$x-x^{2}+x$
$x^2-y-2=0$
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