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Sehingga bentuk ini juga sama dengan:
x = √[12+(√12+√12+√12+√...)]
x = √[12 + x]
Kuadratkan:
x² = 12 + x
x² - x - 12 = 0
(x+3)(x-4) = 0
Ambil penyelesaian positif, maka:
x = 4