Resol N(t)/K-N(t)=R

$$\frac { N ( t ) } { K - N ( t ) } = R$$

Resoleu N (complex solution)

$$\left\{\begin{matrix}N=\frac{KR}{t\left(R+1\right)}\text{, }&K\neq 0\text{ and }R\neq -1\text{ and }t\neq 0\\N\neq 0\text{, }&K=0\text{ and }R=-1\text{ and }t\neq 0\\N\in \mathrm{C}\text{, }&R=0\text{ and }t=0\text{ and }K\neq 0\end{matrix}\right,$$

Resoleu K

$$\left\{\begin{matrix}K=\frac{Nt\left(R+1\right)}{R}\text{, }&t\neq 0\text{ and }N\neq 0\text{ and }R\neq 0\\K\neq 0\text{, }&\left(t=0\text{ or }N=0\right)\text{ and }R=0\end{matrix}\right,$$

Resoleu N

$$\left\{\begin{matrix}N=\frac{KR}{t\left(R+1\right)}\text{, }&K\neq 0\text{ and }R\neq -1\text{ and }t\neq 0\\N\neq 0\text{, }&K=0\text{ and }R=-1\text{ and }t\neq 0\\N\in \mathrm{R}\text{, }&R=0\text{ and }t=0\text{ and }K\neq 0\end{matrix}\right,$$