SOLUTION: Half of a number is 21 less than double the number. Find the number.

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Question 919371: Half of a number is 21 less than double the number. Find the number.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
n/2 = 2n - 21
n = 4n - 42
42 = 3n
+highlight_green%2814%29 = n
And...checking
7 = 28 - 21