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I think the question is "What is an expression for 21 if x=9"

If so, the answer would be 2x + 3 = 21

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9y ago
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Wiki User

9y ago

There are infinitely many possibilities:x + 12

2x + 3

x^2 - 60

are three examples.

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Q: What is an expression for 21 if x 9?
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