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5x + 20 /5 = 11
5x + 20 = 55
5x = 55 - 20
5x = 35
x = 7
tiga data pertama
x = 7
x+2 = 7 + 2 = 9
x+4 = 7 + 4 = 11
maka, rata-rata ketiga data tersebut
x + x+2 + x+4 /3
= 7 + 9 + 11 /3
= 27/3
= 9
jadi, nilai rata-ratanya 9
*NB = per yang diatas panjang ya bukan hanya satu angka, tapi dari angka pertama sampek diangka terakhir disebelah kiri sama dengan