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6÷2=3
umur adi 3×3=9
umur budi 5×3=15
5a = 3b
b = 5a/3
b = 6 + a
5a/3 = 6 + a
5a/3 - a = 6
5a/3 - 3a/3 = 6
(5a - 3a)/3 = 6
2a = 6 x 3
a = 18/2
a = 9
umur Adi 9 tahun