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x² - (-5/7)x - 2/7 = 0
x² + 5/7x - 2/7 = 0
7x² + 5x - 2 = 0
= persamaan kuadrat yang akar-akarnya 2/7 dan -1
x² - (-5/7)x - 2/7 = 0
x² + 5/7x - 2/7 = 0
7x² + 5x - 2 = 0
= persamaan kuadrat yang akar-akarnya 2/7 dan -1