Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -4 <(k−21)/7 <-1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -4 < ( k - 21 ) / 7         (1)
         ( k - 21 ) / 7 < -1         (2)

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    From inequality(1)：
         k ＞ -7
    From inequality(2)：
         k < 14

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    From inequalities (1) and (2)
         -7 < k < 14     (3)

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    The final solution set is :
         -7 < k < 14

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