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bilangan pertama = X
bilangan kedua = Y
maka:
X + Y = 30
X = 2Y.......menjadi X - 2Y = 0
Cara :
X + Y = 30
X - 2Y = 0 -
3Y = 30
Y = 30/3
Y = 10
X + Y = 30
X + 10 = 30
X = 30 - 10
X = 20