$25a^2bc240mn^6-360m^3n^2$
$4x^2-3x+9$
$9\cdot4+6\cdot4$
$9m+3m$
$-8\left(-7\right)-3$
$x^2\frac{dy}{dx}=\left(y+1\right)^2\left(x+1\right)$
$x^2\frac{dy}{dx}+2x^3=x^2y$
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