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3x - [7 + x - (1 + x)] = x - (5 + x) + 5
3x - [7 + x - 1 - x] = x - 5 - x + 5
3x - [7 - 1] = 0
3x - 6 = 0
3x = 6
x = 6/3
x = 2
Respuesta.
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