Răspuns:
2/5+(2/5+2/5-x)-1/5=3/5
2/5+(4/5-x)-1/5=3/5
2/5+4/5-x-1/5=3/5
6/5-x-1/5=3/5
5/5-x=3/5
1-x=3/5
-x=3/5-1
-x=-2/5
x=2/5
Sper că te ajută.
