490
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The factor pairs of 504 are (504,1)(252,2)(168,3)(126,4)(84,6)(72,7)(63,8)(56,9)(42,12)(36,14)(28,18)(24,21)
None of them have a sum (or difference) of -14.
38
143
-43
463
252 x 2 and 126 x 4 (: EDIT : Well, I gave two examples. Choose any one of the examples. (: