$30+4-23+5-67+21$
$-10a+-5a^2+-9a^2+-6a$
$\sqrt{3^{-2}}$
$4\cdot a^2-1+a'=0$
$4x+7>39$
$\lim_{y\to-1}\left(y^3\:-\:2y^2\:+\:3y\:-\:4\right)$
$x^4+10x^2-9$
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