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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 7 ≤-2X+9 <13 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        7 ≤ -2 * x + 9         (1)
         -2 * x + 9 <13         (2)

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    From inequality(1)：
         x ≤ 1
    From inequality(2)：
         x ＞ -2

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    From inequalities (1) and (2)
         -2 < x ≤ 1     (3)

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    The final solution set is :
         -2 < x ≤ 1

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