$-7x^2-24x-9$
$-6x+2\ge8$
$4x^2-9y^6$
$5b+3b-19$
$\left(y\:+\:xy\right)dy\:+\:dx\:=\:0$
$2^2+2\left(-3\right)\left(-4\right)$
$-781-213$
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