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Terigu=y
X=2y
5x+2y= 72000 persamaan 2
Sub x=2y ke persamaan 2
5 (2y)+ 2y= 72000
10y+2y=72000
12y=72000
Y=6000
X= 12.000
4x+y= 48.000+6000
=54000