1/5{2/5+2/5+[3/5+1/5×(4/5-9/5x)]}=2/5
5×1/5×{2/5+2/5+[3/5+1/5×(4/5-9/5x)]}=5×2/5
2/5+2/5+[3/5+1/5×(4/5-9/5x)]=2
2/5+2/5+[3/5+4/25-9/25x]=2
2/5+2/5+[ /15+4/2 -9/25x]=2
2/5+2/5+[19/25-9/25x]=2
2/5+2/5+19/25-9/25x=2
/10+10+19/25 -9/25x=2
39/25-9/25x=2
25×39/25-25×9/25x=25×2
39-9x=50
-9x=50-39
-9x=11
x=-11/9
sau x=-1 intreg 2/9= 1.(2)..........
/bara inseamna supra/
