Răspunsuri

2014-06-24T17:21:26+03:00
X/2+9/2=2x.  amplificam 2x cu 2 ca sa scapam de fractie

x+9=4x
9=4x-x
9=3x
x=9:3
x=3
2014-06-24T17:26:30+03:00