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3A + 2J = 42.000
menggunakan eliminasi maka bilangan pertama sama2 dikali 3 dan bilangan kedua sama2 dikali 2 . maka:
6A + 15J = 150.000
6A + 4J = 84.000
kemudian kedua bilangan tsb dikurangi, sehingga:
11J = 66.000
J = 66.000/11 = 6000
2A + 5.6000 = 50.000
2A = 50.000-30.000
A = 20.000/2 = 10.000