$-20^2$
$12b-5<8b+7$
$\sin=\sqrt{2}-\cos$
$9-5x-21+4x-45$
$6x\cdot2x\cdot3x$
$\lim_{x\to3}\left(\frac{\sqrt{w+1}-2}{w-3}\right)$
$2\sqrt{a}+\sqrt{b}-\sqrt{a}+3\sqrt{a}$
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