$b^2-10b+21$
$-9+4-5\left(8\right)+2\left(3\right)$
$\lim_{x\to0}\left(\frac{x}{x^3-3x^{2-\:2x}}\right)$
$\frac{9r^9}{6r^5}$
$-8\left(-2\right)-\left(-10\right)$
$\int e^{-3t}dt$
$3logx-log\left(x^{\left(2\right)}\right)$
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