Respuestas

2013-08-22T22:30:55+02:00
5 (7 + 4 x) - 15 - 8 x = 92
35 + 20 x - 15 - 8 x = 92
20 x - 8 x = 92 - 35 + 15
12 x = 72
x = 72 / 12 = 6