$5\cdot0$
$2r\:\left(3s\:+\:5t\right)\:\:$
$5x^2-20x$
$-x^2+x+2>0$
$\left(x^6+x^3+1\right)\left(x^6-x^3+1\right)$
$4x+7<-5+6x$
$6\left(-4+2\right)$
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