$\frac{x-1}{x^3+x^2}$
$x^2-20x+25$
$\lim_{x\to\infty}5e^x+3e^x$
$\frac{18}{s-6}=s-3$
$x^2-4y+2y$
$1-y=324$
$-4=\frac{w}{6}$
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