Jawabanmu

2014-04-14T16:04:31+07:00
Misal : x = banyak siswa pada kelompok semula

7x + 3(9) = (x+3)7,75
7x + 27 = 7,75x + 23,25
27 - 23,35 = 7,75x - 7x
3,75 = 0,75x
x = 3,75/0,75
x= 5
2014-04-14T16:06:24+07:00
7.75 (3+x)=7x+3×9 23.25+7.75x=7x+27 0.75x=3.75 x=5