Centre of mass (C.M.) of three particles of masses $1\,\text{kg}$, $2\,\text{kg}$ and $3\,\text{kg}$ lies at the point $(1, 2, 3)$ and C.M. of another system of particles of $3\,\text{kg}$ and $2\,\text{kg}$ lies at the point $(-1, 3, -2)$. Where should we put a particle of mass $5\,\text{kg}$ so that the C.M. of entire system lies at the C.M. of the first system?