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14 September, 23:02

Translate into an equation and solve.

Twenty-one is three times the difference between three times a number, n, and five.

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  1. 15 September, 02:45
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    21 = 3 (3n - 5)

    21 = 3 (3n) - 3 (5)

    21 = 9n - 15

    +15 + 15

    36 = 9n

    9 9

    4 = n
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