7. (5 points) A set of Go costs 24 yuan, and a set of Chinese chess costs 18 yuan. With 300 yuan, you can exactly buy a total of 14 sets of the two types of chess, among which there are $\qquad$ sets of Chinese chess.
【Analysis】Assuming all are Go boards, then there would be $24 \times 14=336$ yuan, which is $336-300$ $=36$ yuan more than the known 300 yuan. Since a Go board is $24-18=6$ yuan more expensive than a Chinese chess set, we can thus find the number of Chinese chess sets.

【Solution】Solution: Assuming all are Go boards, then the number of Chinese chess sets is:
$$
\begin{aligned}
& (24 \times 14-300) \div(24-18) \\
= & 36 \div 6 \\
= & 6 \text { (sets); }
\end{aligned}
$$

Answer: There are 6 sets of Chinese chess.
The answer is: 6.