$$((R \times k)-(r \times K))=((3 \times 58)-(6 \times 29))$$
$\left\{\begin{matrix}K=\frac{Rk}{r}\text{, }&r\neq 0\\K\in \mathrm{R}\text{, }&\left(R=0\text{ or }k=0\right)\text{ and }r=0\end{matrix}\right.$
$\left\{\begin{matrix}R=\frac{Kr}{k}\text{, }&k\neq 0\\R\in \mathrm{R}\text{, }&\left(r=0\text{ or }K=0\right)\text{ and }k=0\end{matrix}\right.$
