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10 + 3 = 13
13 - 1 = 12
12 + 9 = 21
21 + 0 = 21
21 + 7 = 28
1.- 5 +5+3 =
2.- 13-1+9 =
3.- 21+0+7 =
Rpta: 28
Suerte y exitos!