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umur cyntia = 20 tahun
x = umur Cyntya
y = umur Karina
maka :
x = 2y
x+y = 30
x+y = 30
2y+y = 30
3y = 30
y = 30/3
y = 10 tahun
x = 2y
x = 2 x 10
x = 20 tahun