【Question 7】 "24 Game" is a familiar math game to many people, the game process is as follows: arbitrarily draw 4 cards from 52 playing cards (excluding the jokers), use the numbers on these 4 playing cards $(A=1, J=11, Q=12, K=13)$ to get 24 through addition, subtraction, multiplication, and division. The first person to find the algorithm wins. The game rules state that all 4 playing cards must be used, and each card can only be used once. For example, 2, 3, 4, $Q$ can be calculated as $(2 \times Q) \times(4-3)$ to get 24.

If in one game, you happen to draw $7,9, Q, Q$, then your algorithm is $\qquad$
Parse: $(Q \times 9)-(Q \times 7)$