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200 x + 500 y = 5400
2 x + 5 y = 54
2 (18-y) + 5 y =54
36 - 2y + 5y =54
3y = 54 - 36
= 18
y= 18/3
= 6
x = 18 - y jadi untuk mata uang 200 san ada 12 keping dan mata uang 500san ada
= 18 - 6 6 keping
= 12