$11-12\left(x+7\right)\left(x-5\right)$
$\:21\:+\:1-2$
$\int ke^{2t}dt$
$3=3c+b$
$[1+\frac{x}{2}]^{2}$
$3\left(m-n\right)-8a\left(n+m\right)$
$\int\frac{x}{\left(x-1\right)\left(9-x^2\right)}dx$
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