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umur Dian dulu =8/7×14=16
umur mereka sekarang=(16+3)+(14+3)=19+17=36
Dian = D........ nadin = N
7(D-3) = 8(N-3)
7D - 21 = 8N - 24
7D - 8N = -3
7D - 8(17) = -3
7D = -3 + 136
7d = 133
d(dian) = 133/7 =19 tahun
dian + nadin = 19 + 17 = 36