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Reno = B= ( a+6 )
(4+a)+(4+a+6) = 6(a+6)-(a)
14 + 2a = 6a+36-6a
14+2a = 36
2a = 22
a = 22:2 = 11
usia reno = a+6
= 11 + 6 = 17 tahun