Solve for μ_3
\left\{\begin{matrix}\mu _{3}\leq \frac{f_{3}}{N}\text{, }&N>0\\\mu _{3}\in \mathrm{R}\text{, }&f_{3}\geq 0\text{ and }N=0\\\mu _{3}=\frac{f_{3}}{N}\text{, }&f_{3}\geq 0\text{ or }N\neq 0\\\mu _{3}\geq \frac{f_{3}}{N}\text{, }&N<0\end{matrix}\right.
Solve for f_3
f_{3}\geq N\mu _{3}
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