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3 - 2(x - 1) = 1 - x
3 - 2x + 2 = 1 - x
5 - 2x = 1 - x
5 - 1 = - x + 2x
4 = x
Respuesta.
x = 4
3-2x+2=1-x
5-2x=1-x
5-1=-x+2x
4=x