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Range("a1").GoalSeek Goal:=0, ChangingCell:=Range("b1")

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Worksheets("Sheet1").Range("Polynomial").GoalSeek _
    Goal:=15, _
    ChangingCell:=Worksheets("Sheet1").Range("X")
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Automatic Goal Seek

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x=a+1
x.GoalSeek Goal:=2, ChangingCell:=a
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