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Wiki User
-22
Jennie Konopelski ∙
The factor pairs of -21 are (21,-1)(7,-3)(-21,1)(-7,3)
None of them total negative one. I suppose you could use twenty ones and -21, but that's pretty ugly.
-20
-21
1
24
-1
6*1
-6 and -1.
1 and 4
21
41