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Caso.
Factor comun por agrupación de terminos.
3a - b² - 3b + ab = Agrupas
(3a - 3b) + (ab - b²) = Sacas factor comun 3 y b
3(a - b) + b(a - b) = Sacas factor comun (a - b)
(a - b)(3 + b)
Respuesta.
(a - b)(3 + b)