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adik = a
Kakak= k
a = K - 5
(a + 5) + (k + 5) = 35
a + k + 10 = 35
a + k = 25
(k - 5) + k = 25
2k = 25 + 5
2k = 30
k(kakak) = 15
a(adik) = 15 - 5 = 10