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3x+3y+z=21000...(2) 4x+6000+3z=26000
3x+z=12000...(3) 4x+3z=20000
z=12000-3x 4x+3(12000-3x)=20000
eliminasi (2) dan (3) 4x+36000-9x=20000
3x+3y+z=21000 -5x=-16000
3x +z=12000 x=3200
------------------------ - z=12000-3x
3y=9000 =12000-9600
y=3000 =2400
maaf kalu salah : )