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31 October, 10:26

Twice a number is 21 less than 5 times to number

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  1. 31 October, 10:34
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    2n = 5n-21

    5n-2n=21

    3n=21

    n=7
  2. 31 October, 10:34
    0
    2x = 5x - 21

    +5x + 5x

    7x = - 21

    7 7

    x = - 3
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