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Luis Guzman
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Algebra
The sum of nine and three times a number is 81.
AlgebraHouse
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Re: Algebra
x = the number
3x + 9 = 81 {the sum of 9 and three times a number is 81}
3x = 72 {subtracted 9 from each side}
x = 24 {divided each side by 3}
The number is 24
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