$3x^2-9x-2$
$x^2-120x-3746.9$
$6x^2-5x+9$
$\frac{1}{5}=\frac{x}{400}$
$2\ge f-8$
$\left(4a-5b\right)^5$
$-1\:x\:\left(10\right)$
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