$x\frac{dy}{dx}+y=\frac{7}{x}+9x$
$2x^{3+2x+1}$
$4x^4-b^8$
$\left(20-k\right)^2$
$2x^4+3x^3-2x^2-x$
$\frac{dy}{dt}=ln\left(3t\right)y$
$64a^2-121b^2$
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