'Perfect' Tube Puzzle

RETURNING home after an evening playing chess, I spotted the following serial number on a Central Line carriage: 91221.
As usual, each number should be used once, and once only, and must be added, subtracted, multiplied or divided to make a balanced equation.

There is a perfect solution, ie one that uses the numbers in the order they appear.
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My solution: 9 ÷ (1 + 2) = 2 + 1