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19 May, 00:27

Which of the following is the solution for 9<=1-4x<21

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  1. 19 May, 02:18
    0
    -5 < x <=-2

    Step-by-step explanation:

    9<=1-4x<21

    Subtract 1 from each side

    9 - 1<=1-1-4x<21-1

    8 < = - 4x < 20

    Divide each side by - 4. That means to flip all inequalities

    8/-4 > = - 4x/-4 >20/-4

    -2 >=x > - 5

    -5 < x <=-2
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