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2(a - b) = 6 => a - b = 3
a + b = 27
a - b = 3
--------------- +
2a = 30
<=> a = 30/2
<=> a = 15
a + b = 27
15 + b = 27
<=> b = 27 - 15
<=> b = 12
Bilangan-bilangan tersebut adalah 15 dan 12