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(r + t)(x - 3) - (3r - 1)(-3 + x) + 3 - x
Agrupando términos:
(r + t)(x - 3) - (3r - 1)(x - 3) - (x - 3)
(x - 3)(r + t - 3r + 1 - 1)
(x - 3)(t - 2r)
ESO ES TODO, SALUDOS..............................