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b = 2a
(a+6)/(b+6) = 7/10
7(b+6) = 10 (a+6)
7b + 42 = 10a + 60
7 (2a) + 42 = 10 a + 60
14a + 42= 10a + 60
4a = 18
a = 4.5 tahun