$\frac{dy}{dx}=\left(-\frac{ax+by}{bx+cy}\right)$
$a^2-b^2;\:a=-1;\:b=2$
$\frac{dy}{dx}=\frac{\left(4x^3+1\right)}{y\left(2+3y\right)}$
$100-2x+700$
$\int\left(\frac{-2x}{x^2+x+1}\right)dx$
$x^2+4\ge0$
$\:-3\:x\:\:4\:\:x\:\:-2\:\:\:x\:-1$
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