Let
\[
\vec{a}=2\hat{i}+3\hat{j}+\hat{k},\quad
\vec{b}=4\hat{i}+\hat{j},\quad
\vec{c}=\hat{i}-3\hat{j}-7\hat{k}
\]
If
\[
\vec{r}=x\hat{i}+y\hat{j}+z\hat{k},
\]
\[
\vec{r}\cdot\vec{a}=9,\quad
\vec{r}\cdot\vec{b}=7,\quad
\vec{r}\cdot\vec{c}=6,
\]
then \((x,y,z)=\)