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Many people get - 2 * - 3 wrong because it looks symmetric but is, in fact, not. This is the right solution:
- [2 * [- 3]]
- 2 * - 3 only has two possible interpretations: the one above, and the wrong one below:
[- 2] * [- 3] (wrong)
To see that the former is right and the latter is wrong, note that unary minus has higher charge than times. However, also note the charge inversion which occurs for the second unary minus. The second unary minus also has higher charge than times, but there is no way it can become the principal operator.
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