$7n-n+4=16$

$x\frac{dy}{dx}-y=\frac{y^2}{2}$

$\int\frac{-5x^2+19x+8}{3x^3-4x^2}dx$

$\frac{dy}{dx}=2\left(2000-y\right)$

$\frac{dy}{dx}=\left(x-6\right)e^{-2y}$

$\frac{\sin\left(5x\right)+\sin\left(x\right)}{\cos\left(5x\right)+\cos\left(x\right)}=\frac{\sqrt{3}}{3}$

$\frac{dy}{dx}=\frac{1}{e^{3x}}$