$9x^2=-3x+5$
$3x^2-6x+6$
$7-x\ge5$
$\left(5x^4-6\right)^2$
$-2.5-\frac{2}{5}$
$\cos^{-1}\left(\cos\left(\pi\right)\right)$
$b+7ab-4ab-b$
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