$x^2+20x+81$
$\int\left(x^{-20}\right)dx$
$\left(-\:5y\:-\:7\right)\:^2$
$\left(4xyz-2x^2y\right)^2$
$-e^{-\infty}$
$9y^2+24yz+16z^2$
$x^2+11x+12\ge0$
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