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-2 - 6 + 1 + 9 + 3 -5 - 6 + 8 + 9 - 15 + 13 - 20 + 40 =
-8 + 1 + 9 + 3 - 5 - 6 + 8 + 9 - 15 + 13 - 20 + 40 =
-7 + 9 + 3 -5 - 6 + 8 +9 - 15 + 13 - 20 + 40 =
2 + 3 - 5 - 6 + 8 + 9 - 15 + 13 - 20 + 40 =
5 - 5 - 6 + 8 + 9 - 15 +13 -20 + 40 =
0 - 6 + 8 + 9 - 15 + 13 - 20 + 40 =
-6 + 8 +9 -15 + 13- 20 + 40 =
2 +9 - 15 + 13 -20 + 40=
11 - 15 + 13 - 20 + 40 =
-4 + 13 - 20 + 40=
9 - 20 + 40 =
- 11 + 40 =
29
porque -5+3-6+1+9+3-5-6+8+9-15+13-20+40= 29
debe hacer primero la suma y cuando te de el resultado lo resta y ay ya le da ese total............ OK