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18 + 24 = 42
18 x 24 = 432
⇔ xy = 432
⇔ x(42-x) = 432
⇔ 42x - x² = 432
⇔ x² - 42x + 432 = 0
⇔ ( x - 18)(x - 24) = 0
x1 = 18 dan x2 = 24