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To solve the equation 9x = 21, you would first need to isolate the variable x by dividing both sides by 9. This would give you x = 21/9, which simplifies to x = 7/3 or x = 2.33 (rounded to two decimal places). Therefore, the value of x that satisfies the equation 9x = 21 is x = 7/3 or x = 2.33.
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