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4 × 7,9 = 23,4 + x
x = 31,6 - 23,4
x = 8,2 (D)
7,9 x 4 = 31,6 -> Masih ada didik
7,8 x 3 = 23,4 -> Didik udh out
Hasilnya dikurang 31,6 - 23,4 = 8,2
Jadi hasil ulangan didik itu 8,2