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> ... items out of balance in a column ..
Here's a formulas play which should do the job ...
Assume your source values are running in A2 down
(ie All figs are in col A only, scrambled and there may be mulltiple duplicate pairs of knock-off figs)
In B2: =IF(A2="","",IF(A2<0,-A2&"_"&COUNTIF(A$2:A2,A2),A2&"_"&COUNTIF(A$2:A2,A2)))
In C2: =IF(COUNTIF(B:B,B2)=2,"x","")
Copy B2:C2 down to the last row of source data
Col C will flag all knock-off items as "x"
Filter on col C for "x" to retrieve the whole lot at one go
Select all these rows, right-click > Delete Row
Remove the filter, and the remaining rows will be the desired non knock-off items
Alternatively, just filter for blanks in col C -- these are the non knock-off items,
then copy n paste special as values elsewhere