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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality -1704-19*t >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -1704 - 19 * t >0         (1)

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    From inequality(1)：
         t < -89.684211

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    The final solution set is :
         t < -89.684211
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 639+7t >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        639 + 7 * t >0         (1)

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    From inequality(1)：
         t ＞ -639/7

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    The final solution set is :
         t ＞ -639/7

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