$-8+9\left(\left(-6+6r\right)\right)$
$\left(9x^9-10b^{12}\right)^2$
$b^4-25$
$\lim_{x\to\:0}\left(\frac{x+1}{x^3+2x^2}\right)$
$216e^3-1$
$2x-3\le-5$
$\sqrt{x^3-2}y'\:=\:x^2$
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