$4x^2+9y^2-16x+18y-11=0$
$6m-9n+21nx-14mx$
$\frac{1}{2}xy+y$
$\frac{dy}{dx}+y=y^2e^{3x}$
$\int te^{18t}dt$
$y'=3x^3=-5y^2+2$
$\left(2x^2+1oy\right)^2$
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