12. (3 points) Xiao Hua and Xiao Jun both have some glass balls. If Xiao Hua gives Xiao Jun 4 balls, the number of Xiao Hua's glass balls will be 2 times that of Xiao Jun; if Xiao Jun gives Xiao Hua 2 balls, then the number of Xiao Hua's glass balls will be 11 times that of Xiao Jun. Xiao Hua originally had $\qquad$ glass balls, and Xiao Jun originally had $\qquad$ glass balls.
【Answer】Solution: Let's assume Xiao Jun originally had $x$ glass balls,
$$
\begin{array}{c}
(x-2) \times 11=(x+4) \times 2+4+2, \\
11 x-22=2 x+8+4+2, \\
11 x-2 x-22=2 x+14-2 x, \\
9 x-22+22=14+22, \\
9 x \div 9=36 \div 9, \\
x=4, \\
(4+4) \times 2, \\
=10 \times 2,
\end{array}
$$

Answer: Xiao Hua originally had 20, Xiao Jun originally had 4, so the answers are: 20, 4.