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5x + 7y = 13000
Dieliminasi x nya,
10x + 20y = 35000
10x + 14y = 26000
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6y = 9000
y = 1500 <- harga gasing
2x + 4(1500) = 7000
2x = 1000
x = 500 <- harga kelereng
12 x 500 = 6000