Respuestas

2012-10-25T04:02:46+02:00

5.(7+4x)-15-8x=92

35+20x-15-8x=92

20+12x=92

12x=72

x=6

2012-10-25T04:03:31+02:00

3x + 5 = 4x - 7      3x + 5 = 4x + -7      3x - 4x = -7 + - 5 -x = -7 + -5              -x = -12               x = 12