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(4ax - 4an + 4a) - (x - n + 1) = Sacamos factor comun 4a
4a( x - n + 1) - (x - n + 1) = Sacamos factor comun (x - n + 1)
(x - n + 1)(4a - 1)
Respuesta.
(4a - 1)(x - n + 1)