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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -3 ≤3x ≤7 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -3 ≤3 * x         (1)
        3 * x ≤7         (2)

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    From inequality(1)：
         x ≥ -1
    From inequality(2)：
         x ≤ 7/3

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    From inequalities (1) and (2)
         -1 ≤ x ≤ 7/3    (3)

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    The final solution set is :
         -1 ≤ x ≤ 7/3

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