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Verified answer
5 siswa = 644 siswa = y
5 . 64 - 1 . 80 / 4 = y
320 - 80 / 4 = y
240 / 4 = y
60 = y
rata-rata yg baru nya 60 :D
x = 320 - 80 / 4
x = 240 / 4
x = 60