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I need help! The question is what numbers for which the rational expression is underfined in 8/9x+7

  • Algebra -

    If you meant it the way you typed it there is no restriction.
    if you mean 8/(9x) + 7 , then x≠0
    if you meant 8/(9x+7) , then x ≠ -7/9

    see how important correct placement of brackets is ?

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