$\int\frac{\left(-9x-9\right)}{\left(x\left(x^2-9\right)\right)}dx$
$-2m^3n\left(-10m+5mn-y\right)$
$5d^3+16de^2-20df^3$
$\int2x^4e^{-x}dx$
$\frac{5x^2+26+20}{x+4}$
$2x^2+3x+6=0$
$\int\left(\frac{7}{x\sqrt{x^2-1}}\right)dx$
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