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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 20000*7.2 ≤20000*4.2%*（7.2-X） .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20000 * 7.2 ≤20000 * 4.2 % * ( 7.2 - x )         (1)

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    From inequality(1)：
         x ≤ -164.228571

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    The final solution set is :
         x ≤ -164.228571

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