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

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

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    From inequality(1)：
         -0.566084 ≤ x ≤ 7.066084

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    The final solution set is :
         -0.566084 ≤ x ≤ 7.066084

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