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→ 6,6(x + 1) = 6,5x + 9
→ 6,6x + 6,6 = 6,5x + 9
→ 6,6x - 6,5x = 9 - 6,6
→ 0,1x = 2,4
→ x = 2,4/0,1
→ x = 24
x → banyak siswa awal