Respostas

2014-03-04T10:58:18-03:00

3x - [2 - (x - 1)] = 5x

3x - [2 - x + 1] = 5x

3x - [-x +3] = 5x

3x +x - 3 = 5x

4x - 3 = 5x

4x - 5x = 3

-x = 3

x = - 3