$\frac{64n^{27}-125}{4n^9+5}$
$-12+11-9-9-15$
$3x+5x-9x+15x-25x-3x$
$\left(\frac{3}{n}-\frac{3}{n}\right)^2\:-1$
$\lim_{x\to\infty}\left(\frac{1}{x}-1\right)\cdot\frac{1}{x^2-1}$
$5.50-3.50+1.50$
$\frac{4}{9}z-\frac{3}{9}z+2-\frac{5}{9}z-9$
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