$\left(x^2-9\right)\frac{dy}{dx}=-xy$
$\int\left(x^2+1\right)^6dx$
$21x^{n+3}y^{m-1}:24x^{n+1}y^{m}$
$-6x^2-40x-92=-9x^2-70x-164$
$\lim_{x\to\infty}\left(\frac{6x}{3x-1}\right)$
$x^2+2x+35$
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