$25kx^2-20kx+4k$
$-\int\frac{x^5}{x^4-1}dx$
$\frac{\left(2a\right)^{9}+\left(b\right)^{a}}{2a+b}$
$\left(-5p^2-4t^3+10a^4\right)^3$
$\lim_{x\to2}\left(\frac{x^2-x-2}{x^2-5x+6}\right)$
$-\frac{5x-6}{x+1}$
$-x^2+5x+6$
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