Respuestas

2012-03-27T23:10:08+02:00

x - 2 (1 - x) + 7 = -3 (2x - 1) + 3

x - 2 + 2x + 7 = -6x + 3 + 3

x + 2x + 6x = 3 + 3 + 2 - 7

9x = 1 | : 9

x = 1/9