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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -7 ≤[2（1+3X）]÷7 <9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -7 ≤ ( 2 * ( 1 + 3 * x ) ) ÷ 7         (1)
         ( 2 * ( 1 + 3 * x ) ) ÷ 7 <9         (2)

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    From inequality(1)：
         x ≥ -17/2
    From inequality(2)：
         x < 61/6

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    From inequalities (1) and (2)
         -17/2 ≤ x < 61/6    (3)

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    The final solution set is :
         -17/2 ≤ x < 61/6

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