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4y² - 8y + 4 = 7y² + 6y - 1
3y² + 14y - 5 = 0
(3y - 1)(y + 5) = 0
y = 1/3 atau y = - 5
ambil y = 1/3 > 0
barisannya:
4/3 , - 4/3 , 4/3
suku ke 4 nya : - 4/3