Respuestas

2011-11-16T17:50:55+01:00

23 x ( 4 + 5 - 6) = 2x + 3x - 9x + 46

23 x 3 = -4x + 46

69 = -4x + 46

4x = 49 - 69

4x = -20 | :4

x = -5