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Pada frekuensi.
30 = 5 + a + 10 + b + 3
30 = a + b + 18
a + b = 12
Eliminasikan:
5a + 7b = 70
7a + 7b = 84 - (Hasil kali persamaan frekuensi dengan 7)
-2a = -14
a = 7 [C]