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3d+4a=500.000
3(2a)+4a=500.000
6a+4a=500.000
10a=500.000
a=50.000
d=2 x 50.000=100.000
2d+3a=2(100.000)+3(50.000)=200.000+150.000=350.000 rupiah
3 anak anak Rp.150.000