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81 (Cari perkalian hasilnya 81 jika dijumlahkan hasilnya - 18)
1 x 81
3 x 27
9 x 9
x² - 18x + 81
x² - 9x - 9x + 81
x(x - 9) - 9(x - 9)
(x - 9)(x - 9)