Overview: 3 questions will be solved this time.Among them
           ☆3 inequalities

[ 1/3Inequality]
    Assignment:Find the solution set of inequality -3x ≤9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -3 * x ≤9         (1)

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    From inequality(1)：
         x ≥ -3

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    The final solution set is :
         x ≥ -3
[ 2/3Inequality]
    Assignment:Find the solution set of inequality 3x-2 <4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        3 * x - 2 <4         (1)

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    From inequality(1)：
         x < 2

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    The final solution set is :
         x < 2
[ 3/3Inequality]
    Assignment:Find the solution set of inequality 2x-1999 ≤3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * x - 1999 ≤3         (1)

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    From inequality(1)：
         x ≤ 1001

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    The final solution set is :
         x ≤ 1001

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