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3x+y=9000 (kali 2)
4x+2y=13000
6x +2y=18000 -
-2x= -5000
x= -5000/-2
x= 2500
3x + y=9000
3(2500) + y=9000
7500+y=9000
y= 9000-7500
y= 1500
5x + 2y
=5(2500) + 2(1500)
=12500 + 3000
=Rp.15500