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b + 3 + b = 1/7 (10b + 3 + b)
b + b + 3 = 1/7 (10b + b + 3)
2b + 3 = 1/7 (11b + 3)
7 (2b + 3) = 1 (11b + 3)
14b + 21 = 11b + 3
14b - 11b = 3 - 21
3b = - 18
b = - 18/3
b = - 6
Respuesta.
b = - 6