Răspunsuri

2014-09-04T10:14:11+03:00
2014-09-04T10:41:40+03:00
3x + 2 + x - 7 4x - 1 + 3x 
3x+x-4x-3x=-1-2+7
-3x=4
x= 
 \frac{4}{-3}