Although negative numbers aren't usually considered factors, you can use -21, -3 and -2.
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6 + 3 + 2 7 + 3 + 1
The factors of 21 that add up to 8 are 1 and 7.
I suppose you could use -42 twice. -63 and -21
factors of 30 that add to 17 are 2 and 15
15 and 4 are the factors of 120 that add up to 19.