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3x + 2y = 65.000
x nya ganti y
jadi 6x + 4y = 130.000
9y + 4y = 130.000
13y = 130.000
y = 10.000
2x = 3y
2x = 3 x 10.000
2x= 30.000
x = 15.000
4x + 2y = 4 x 15.000 + 2 x 10.000
= 80.000
maaf klo agak agak ga ngerti.