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a+b+h=100.000 (2)
b-h=5.000 (3)
eliminasi (1) dan (2)
a-b-2h=20.000
a+b+h=100.000
2b+3h=80.000 (4)
eliminasi (3) dan (4)
b-h=5.000 x2
2b+3h=80.000
5h=70.000
h=14.000 -> subtitusi ke (3)
b=19.000 -> subtitusi ke (2)
a=67.000