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19 May, 18:11

A number t decreased by 2 is at least 7

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  1. 19 May, 21:36
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    t - 2 ≥ 7; t ≥ 9

    Explanation:

    "a number t" = t

    "decreased by 2" = - 2

    "Is at least 7" = ≥ 7

    So, t - 2 ≥ 7

    To solve for t - 2 ≥ 7, add 2 to both sides of the equation

    t - 2 ≥ 7

    t - 2 + 2 ≥ 7 + 2

    t ≥ 9

    So, t ≥ 9
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