Răspunsuri

2014-05-22T22:37:36+03:00
Cel mai inteligent răspuns!
2014-05-22T22:40:39+03:00
X-nr de banci
2x+5-nr de elevi

2x+5=3(x-5)
2x+5=3x-15
2x-3x=-15-5
-x=-20
x=20

2*20+5=40+5=45

2 5 2