If $\mathrm{A} \equiv(\mathrm{x}, 4,-1), \mathrm{B} \equiv(3, \mathrm{x},-5)$ and $\mathrm{C} \equiv(2,-2…
If $\mathrm{A} \equiv(\mathrm{x}, 4,-1), \mathrm{B} \equiv(3, \mathrm{x},-5)$ and $\mathrm{C} \equiv(2,-2,3)$ are the vertices and $\mathrm{G} \equiv(2,1,-1)$ is the centroid of the triangle $A B C$, then the value of $x$ is