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x - 15 = 2√x ...... kedua rua pangkatkan 2
(x - 15)² = (2√x)²
x² - 30x + 225 = 4x
x² - 30x - 4x + 225 = 0
x² - 34x + 225 = 0
(x - 9) (x - 25) = 0
x - 9 = 0 atau x - 25 = 0
x = 9 atau x = 25