$x-7<-1$
$\frac{n}{n+3}+\frac{12n}{n-3}-\frac{9}{n^2-9}$
$\frac{\left(3x^3-5x^2-7x-3\right)}{\left(x^2-3x+1\right)}$
$9\tan\left(1\right)^2-27$
$\frac{1}{2}\:\int_0^{2\pi}\:\left(1\right)dx$
$xy+3+3x^2=5$
$\lim_{x\to\infty}\left(\frac{x-1}{x-4}\right)^{2x}$
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