Răspunsuri

2014-11-16T20:20:00+02:00
2014-11-16T20:20:32+02:00
4x - 2 - 3x + 15 = 5x - 15
x + 13 = 5x -15
5x - x = -15 - 13
4x =  - 28
 x = ( - 28 ) : 4
 x = - 7