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4x + 5y = 15000 dikali 2
(8x + 8y) - (8x + 10y) = 28000 - 30000
-2y = -2000
y = -2000/-2
y = 1000
2x + 2(1000) = 7000
2x = 7000 - 2000
x = 5000/2
x = 2500
maaf cuma kasih metode ini...