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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (-19-a)/(-6-a) <= 4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( -19 - a ) / ( -6 - a ) <= 4         (1)
        From the definition field of divisor
         -6 - x ≠ 0        (2 )

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    From inequality(1)：
         a ≤ -6 或  a ≥ -5/3
    From inequality(2)：
         a < -6 或  a ＞ -6

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    From inequalities (1) and (2)
         a < -6 或  a ≥ -5/3    (3)

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    The final solution set is :
         a < -6 或  a ≥ -5/3

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