Răspunsuri

2014-11-17T20:15:10+02:00
3x+42=x+156 | -x
2x+42=156 | -42 
2x=114 | :2
x=57
15 4 15
2014-11-17T20:26:46+02:00
3·x+42=x+156.
3X+42=x+156 | -x
2x+42=156
2x=156-42
2x=114
x=114:2
x=57