$\frac{6x+8+1}{x+5}$
$2x^2+11x+21\:=\:0$
$\left(x^2+1\right)\left(\sqrt{x}-6\right)$
$n\:=\left(5x+1\right)^2+5\left(x-1\right)^2$
$\int\frac{x-2}{x^2-4}dx$
$\frac{n}{2}-\frac{21}{2n}=2$
$\lim_{x\to0}\:\frac{\left(e^x-1-7x\right)}{x^2}$
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