$x+x^5+x^4+x^3$
$-9z^3\cdot3z^4$
$\left(2a^4-4b^3\right)^2$
$20x-23<-15x+2$
$20 - ( - 63 )$
$\frac{\left(5y-1\right)}{-3\:\:}<\frac{\left(7\left(y+1\right)\right)}{-2}$
$y^2+50y+100$
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