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Mengapa + 2 , + 4 , +6 ?
karena jarak antar bil.genap dgn.bil genap lain itu 2
x + x + 2 + x + 4 + x + 6 + x + 8 = 320
5x + 20 = 320
5x = 320 - 20
5x = 300
x = 300/5
x = 60
Ikuti aturan bil genap, maka
bilangannya 60,62,64,66,68