$2x-7\le-18x-1$
$\sqrt{25x^2y}$
$\left(4-2i\right)$
$sec-tan$
$\left(z^2-2\right)\left(z^2+2\right)$
$\left(5^{-1}\right)\:-\:\left(5^0\right)$
$-x^2+9x+9$
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