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maka :
A - 7 = 6( B -7 )
A -7 = 6B - 42
6B - A = 35 .... (1)
2(A + 4) = 5(B + 4) + 9
2A + 8 = 5B + 20 + 9
5B - 2A = - 21 ....(2)
NAH, (1) DAN (2)
6B - A = 35 |x2| 12B - 2A = 70
5B - 2A = - 21 |x1| 5B - 2A = -21
---------------------- (DIKURANGI)
= 7B = 91 , B = 13, A = 43
jadi umur ayah adalah 43