Answer:
the number is 7
Explanation:
let the number be n , then 4 times the number is 4n
the difference of 4n and 7 is 4n - 7 , then the equation is
4n - 7 = 21 ( add 7 to both sides )
4n = 28 ( divide both sides by 4 )
n = 7
That is the number is 7
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