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[+7-20]+40
[-13]+40
-13 +40
27
(+7)+[(-20)+(+40)]
+7+[-20+40]
+7+[20]
7+20
27
[+7-20]+40
[-13]+40
27
[(+7)+[(-20)+(+40)]
+7+[-20+40]
+7+20
27
da lo mismo jeje