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a5 = a1 + (5 - 1) r = 149/6
a7 = a1 + (7 - 1) r = 363/4
Restamos: 6 r - 4 r = 2 r = 363/4 - 149/6 = 791/12
Por lo tanto la razón es r = 791/24
Luego podemos hallar a1 = a5 - 4 r = 149/6 - 4 . 791/24 = - 107
Finalmente a6 = - 107 + 5 . 791/24 = 1387/24
Saludos Herminio