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8x+10y=1.200.000
15x+10y=1.900.000 -
-7x = -700.000
x = 100.000
3x+2y=380.000
2y = 380.000 - 300.000
y=40.000
x+3y=100.000+3(40.000)
=220.000
jadi jawabannya yang a,