$y'=21+18x+21y+18xy$
$\frac{dy}{dx}=\frac{xy-x^3y}{y-1}$
$x^2+9x+7$
$\frac{5x+2}{7x^2}+\frac{8x+2}{7x^2}$
$3n^3\cdot3n^{-3}$
$3xy^3\left(x^2y+3\right)$
$\frac{3m^{-4}}{m^3}$
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