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(7x + 3. 9) / x + 3 = 7,75
7x + 27 = 7,75 (x+3)
7x + 27 = 7,75x + 23,25
27 - 23,25 = 7,75x - 7x
3,75 = 0,75x
5 = x
jadi jumlah siswa dlm kelompok semula adalah 5 orang