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Correct
x2 - 24x + 135 = 0 x2 - 15x - 9x + 135 = 0 x (x - 15) - 9(x - 15) = 0 (x - 15)(x - 9) = 0 x - 15 = 0, x - 9 = 0 x = 15, x = 9 ans: (b)