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Eva : 9 tahun
9+16 = 25 tahun :)
usia eva = y
x = 7+y
2+x = 2y
x-y = 7
x-2y = -2
-------------- (-)
y = 9
x-9 = 7
x = 7+9 = 16
jumlah usia doni dan eva = 16+9 = 25 tahun