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5 th kemudian, a = 15, b = 10,
sekarang a = 20
A-2B=10... (pers. 1)
A+5=1/2B
A-1/2B = -5 (dikali 2)
2A-B = -10 ... (pers. 2)
eliminasi pers. 1 & 2
A-2B = 10 ( dikali 1 ) A-2B = 10
2A-B = -10 ( dikali 2 )
A = 30/5
A = 6 tahun