x - [3a +2( -x +1)]
x -[3a -2x +2]
x -3a +2x -2 = 3x -3a-2
La respuesta es 3x -3a-2
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x - [3a +2( -x +1)]
x -[3a -2x +2]
x -3a +2x -2 = 3x -3a-2
La respuesta es 3x -3a-2