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4K + 2A = 84
Pake cara eliminasi, bil.pertama dikali 4 dan bil.kedua dikali 1
4K + 4A = 120
4K + 2A = 84
Kemudian kedua bil.itu dikurangi
2A = 36
A = 36/2 = 18
K+A = 30
K = 30 - 18
K = 12