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Verified answer
Kelas 10 MatematikaBab Persamaan dan Pertidaksamaan Kuadrat
(13x - 39)/(x + 12) < 0
13 (x - 3) . (x + 12) < 0
x - 3 < 0
x < 3
x + 12 > 0
x > -12
-12 < x < 3