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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality x <-690 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x < -690         (1)

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    From inequality(1)：
         x < -690

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    The final solution set is :
         x < -690
[ 2/2Inequality]
    Assignment:Find the solution set of inequality x >-690 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x > -690         (1)

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    From inequality(1)：
         x ＞ -690

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    The final solution set is :
         x ＞ -690

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