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I can do it with only 9.

<span style="FILTER: FlipH;">9</span>



FlipH is not a legal operator.


No idea what you're talking about. I'm merely improving the typography.


From the original spec of the problem: "only the operators +, -, x, /, and ^ (exponentiation), and parenthesis for grouping"


It has to be presentable. Typography matters.




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