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A + 3.000= B (pers.1)
A + B = 18.000(pers.2)
(masukkan pers.1 ke pers.2)
A+A+3.000 = 18.000
2a +3000 = 18000
2a = 18.000-3.000
2a = 15.000
a = 15.000/2
a = 7.500 (Amir)
A - B = -3000
A + B = 18.000
eliminasi
2A = 15.000
A = 7500