$\frac{x^{4}+11x^{4}+18}{x^{4}+9}$
$x+2\le-\frac{2}{3}+2x$
$-\int\frac{1}{\left(1+x^2\right)^3}dx$
$-\frac{2}{t+2}+\frac{5}{t+2}=-7+\frac{3}{t+2}$
$-a-3$
$\frac{2x+1}{-4x+8}$
$\frac{\left(8^3\right)^4\cdot8^{-9}}{8^{-3}}$
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