Sub atest()
Dim LR As Long, i As Long
LR = Range("G" & Rows.Count).End(xlUp).Row
For i = 1 To LR
With Range("G" & i)
If Right(.Value, 1) = "-" Then .Value = -1 * Left(.Value, Len(.Value) - 1)
End With
Next i
Range("G1:G" & LR).NumberFormat = "#,##0.00_);[Red](#,##0.00)"
End Sub