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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -15x^2-6 <-21x .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -15 * x ^ 2 - 6 < -21 * x         (1)

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    From inequality(1)：
         x < 2/5 或  x ＞ 1

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    The final solution set is :
         x < 2/5 或  x ＞ 1

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