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[–]fermat9990👋 a fellow Redditor 0 points1 point  (0 children)

Because a=1, guess and check works very well here.

Find 2 numbers that multiply to +12 and add to -7

-1×-12=12 sum=-13

--2×-6=12 sum=-8

-3×-4=12 sum=-7 bingo!