Respuesta:
1/3-2{1/3+3[3\2-1/5(2/3+1)]}=↓
1/3-2{1/3+3[3\2-1/5(5/3)]}=↓
1/3-2{1/3+3[3\2-1/3]}=↓
1/3-2{1/3+3[7/6]}=↓
1/3-2{1/3+7/2}=↓
1/3-2{23/6}=↓
1/3-23/3=-22/3
-22/3=-7333333333
