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x² + 9x - 2x + 18 - 8 = 0
x² + 7x + 10 = 0
(x + 2)(x + 5) = 0
karena x1 > x2
x1 = -2 dan x2 = -5
jawabannya adalah B
x1 - x2 = -2 - (-5) = 3