Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0.21+0.1x <= 20 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.21 + 0.1 * x <= 20         (1)

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    From inequality(1)：
         x ≤ 1979/10

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    The final solution set is :
         x ≤ 1979/10

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