SOLUTION: The difference between three times a number and 21 is three

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Question 418626: The difference between three times a number and 21 is three
Answer by Gogonati(855) About Me  (Show Source):
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Denote the unknown number with x , write the equation based on the given ;
3x-21=3, solve this equation: 3x=24; x=8 The unknown number is 8.