Try this code
Sub delete_dups()
Dim i As Long, lrow As Long

Application.ScreenUpdating = False

With Worksheets("Sheet1")
    .Cells.Sort Key1:=.Range("A2"), Order1:=xlAscending, Key2:=.Range("B2") _
        , Order2:=xlAscending, key3:=.Range("G2"), order3:=xlAscending, Header:=xlYes, OrderCustom:=1, MatchCase:= _
        False, Orientation:=xlTopToBottom, DataOption1:=xlSortNormal, DataOption2:=xlSortNormal, DataOption3:=xlSortNormal
       
    lrow = .Range("A" & .Rows.Count).End(xlUp).Row
    For i = lrow To 2 Step -1
        If .Range("A" & i).Value = .Range("A" & i - 1).Value And .Range("B" & i).Value = .Range("B" & i - 1).Value And _
            .Range("G" & i).Value = .Range("G" & i - 1).Value Then
            .Rows(i).Delete
        End If
    Next i
End With

Application.ScreenUpdating = True

End Sub
Copy the Excel VBA code
Select the workbook in which you want to store the Excel VBA code
Hold the Alt key, and press the F11 key, to open the Visual Basic Editor
Choose Insert | Module
Where the cursor is flashing, choose Edit | Paste

To run the Excel VBA code:
Choose Tools | Macro | Macros
Select a macro in the list, and click the Run button