SOLUTION: Twice a certain number is subtracted from 9 times the number the result is 21 find the number.

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Question 1147282: Twice a certain number is subtracted from 9 times the number the result is 21 find the number.
Answer by Alan3354(69443) About Me  (Show Source):
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Twice a certain number is subtracted from 9 times the number the result is 21 find the number.
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Use n for the "certain number."
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then, Twice a certain number = 2n
9 times the number = 9n
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