Odpowiedzi

2010-03-31T15:55:03+02:00
X+2x-60+3x-120=180
3x+3x-120-60=180
6x=180+120+60
6x=360
x=60
2010-03-31T15:56:26+02:00
X+2x-60+3x-120=180
6x-60-120=180 /+60
6x-120=240 / +120
6x=360 /:6
x=60