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umur ayah = a
umur budi = b
a - 7 = 6 (b-7)
a - 7 = 6b - 42
a = 6b - 35
2(4+a) = 5(4+b)+9
8 + 2a = 20 + 5b + 9
2a = 21 + 5b
2(6b-35) = 21 + 5b
12b - 70 = 21 + 5b
7b = 91
b = 13 thn
a = 6b - 35
= 13x6 - 35
= 78 - 35
= 43 thn