Respuestas

2012-10-19T18:33:58+02:00
2012-10-19T18:37:59+02:00

Sea X el numero:

 

x/3 -15 = x/4 - 18

x/3 - x/4 = -18 + 15

x/12 = -3

x = 12(-3)

x = -36


(-36)/3 -15 = (-36)/4 - 18

-12 - 15 = - 9 -18

-27 = -27