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2 September, 17:57

3 times the difference of a number and 7 is 18

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  1. 2 September, 21:27
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    "the difference " means subtract

    3 (n - 7) = 18

    3n - 21 = 18

    3n = 18 + 21

    3n = 39

    n = 39/3

    n = 13 < = = ur number
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