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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 639+19x >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        639 + 19 * x >0         (1)

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    From inequality(1)：
         x ＞ -33.631579

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    The final solution set is :
         x ＞ -33.631579
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 1704+7x <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1704 + 7 * x <0         (1)

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    From inequality(1)：
         x < -243.428571

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    The final solution set is :
         x < -243.428571

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