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5x = 61.500 x2 10x = 123.000
2x + 4y = 45.000 x5 10x + 20y = 225.000 kurangkan
hasilnya :
-20y = -102.000
y = 102.000/20 =5100
2x + 4y = 45.000
2x = 45.000 - 20.400
x = 24.600/2 =12.300
3x + 4y = 3 x 12.300 + 4 x 5.100 = 57.300
smg mmbntu, maaf klo slh