12. The point on the ellipse $7 x^{2}+4 y^{2}=28$ that is closest to the line $l: 3 x-2 y-16=0$ has the coordinates
12. $\left(\frac{3}{2},-\frac{7}{4}\right)$ Hint: We can set $P(2 \cos \theta, \sqrt{7} \sin \theta)$, and substitute it into the distance formula.