Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 9-c <2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        9 - c <2         (1)

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    From inequality(1)：
         c ＞ 7

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    The final solution set is :
         c ＞ 7
[ 2/2Inequality]
    Assignment:Find the solution set of inequality -3c >15 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -3 * c >15         (1)

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    From inequality(1)：
         c < -5

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    The final solution set is :
         c < -5

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