$3n^2-4n^2+9n-12$
$x\frac{dy}{dx}+y=xe^{-x}$
$3\sqrt{7}+2\sqrt{7}-\sqrt{7}$
$\frac{1}{3x}+\frac{5}{2x}$
$\log_x\left(3\right)=-2$
$m^2n^3-2n$
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