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y=topi
4x+5y=600(x3)
3x+2y=380(x4)
hasilx: 12x+15y=1.800
12x+8y=1.520
y=40
3x+2.40=380
3x=380-120
3x=300
x=100
1x+3y=100+3 x 40
=220
jadi 1 jaket dan 3 topi= 220