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Y = 1000
500X + 1000Y = 237.500
X + Y = 310
(eliminasi)
500X + 1000Y = 237.500
500X + 500Y = 155.000
(dikurang)
500Y = 82500
Y = 165 koin
X + Y = 310
X + 165 = 310
X = 145 koin