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x^2 - mx - 2x + m + 1 = 0
( m - mx) + (x^2 - 2x + 1) = 0
m (1 - x) + (x - 1 ) (x - 1 ) = 0
m (x - 1 ) + (x - 1 ) (x - 1 ) = 0
Espero que te sirva la respuesta