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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -1 ≤-9*(x+5/9*x)/4 ≤1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -1 ≤ -9 * ( x + 5 / 9 * x ) / 4         (1)
         -9 * ( x + 5 / 9 * x ) / 4 ≤1         (2)

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

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

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    The final solution set is :
         -2/7 ≤ x ≤ 2/7

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