Bonjour ThibaultHaller,
Ceci pourrait être une solution
Sub Effacer_x()
Dim rng As Range, i As Integer
'Set the range to evaluate to rng.
Set rng = Range("M6:M100")
'Loop backwards through the rows
'in the range that you want to evaluate.
For i = rng.Rows.Count To 6 Step -1
'If cell i in the range contains an "x", delete the entire row.
If Cells(i, 13).Value < 0 Then
Cells(i, 14).ClearContents
End If
Next
End Sub
Slts