$\frac{x^4}{x^3}+\frac{x^2}{x^2}$
$0.4mn\left(4x-1\right)$
$\frac{165x^4y^6-81x^2y^4}{13x^2y^3+gxy^2}$
$5a\left(13+a\right)-c\left(a+13\right)$
$2x^3-18x$
$\left(3x^3y-2x^2\right)^3$
$\lim_{x\to\infty}\left(\frac{\left(x^2-25\right)}{x^2-4x-5}\right)$
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