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11 August, 08:06

The sum of a number times 7 and 19 is at least 21

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  1. 11 August, 08:31
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    So 7x+19 has to be greater then or equal to 21

    Subtract 19 from both sides to get 7x >_ 2

    so * has to be greater than or equal to 2/7
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