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An equation is any string of variables that 'equates' to a value:

x + 9 = 10

Technically the only number here is 9 :)

An expression that equals 10 but only uses the number nine is:

(9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9) / 9

9/9+9=10

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14y ago

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Q: What is an equation that equals 10 but uses only the number nine?
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