Respuestas

2013-08-24T04:53:34+02:00
10x + 21 = 25 - 2x
12x    = 4

X = 4/12
x = 1/3
 10 + 5x .2 = 4x - 4 - 3x
10x - 4x + x = -4 -107x = -14x = -2