Solve for K
\left\{\begin{matrix}K=-\frac{F}{y}\text{, }&y\neq 0\\K\in \mathrm{R}\text{, }&F=0\text{ and }y=0\end{matrix}\right.
Solve for F
F=-Ky
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Ky=\frac{\mathrm{d}}{\mathrm{d}x}(y)-F
Subtract F from both sides.
yK=-F
The equation is in standard form.
\frac{yK}{y}=-\frac{F}{y}
Divide both sides by y.
K=-\frac{F}{y}
Dividing by y undoes the multiplication by y.
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