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2x+6y=23000|x5|10x+30y=115000-
-22y=-55000
y=2500
5x+4y=30000|x3|15x+12y=90000
2x+6y=23000|x2|4x +12y=46000-
11x=44000
x=4000
3x+2y=>3 (4000)+2 (2500)=12000+5000=Rp.17.000