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x^2 - (5/3 - 4)x + 5/3 . (-4) = 0
x^2 - (5/3 - 12/3)x - 20/3 = 0
x^2 - (-7/3)x - 20/3 = 0 (kali 3 kedua ruas)
3x^2 + 7x - 20 = 0