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B = A + 14
(B + 10) = 2(A + 10)
maka,
(B + 10) = 2(A + 10)
B + 10 = 2A + 20
B = 2A + 20 - 10
B = 2A + 10
2A + 10 = A + 14
2A - A = 14 - 10
A = 4 tahun
B = A + 14
B = 4 + 14
B = 18 tahun
Umur Budi 5 tahun mendatang = 18 + 5
= 23 tahun