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The difference between 3 times a number and 21 as an expression
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The difference between 3 times a number and 21 as an expression

User Rodpl
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\bf \stackrel{\textit{number}}{x}~\hspace{5em}\stackrel{\textit{three times a number}}{3x}~\hspace{5em}\stackrel{\textit{difference of 3x and 21}}{3x - 21}

User Bertrandg
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