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= 78 - ( 9 + 6 + 7 + 6 + 8 + 10+7+8+8)
= 78 - 69 = 9
Maaf kalo salah tp semoga bener :)
69 + x / 10 = 7,8
69 + x = 78
x = 78 - 69
x = 9
Jadi nilai ulangan Lina yang ke 10 yaitu 9