4 b) -{2+(6+4menos2)+(5-(-7-6)-9]+6}=
- {2+(6+4menos2)+(5-(-7-6)-9]+6}
2+8+
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4 b) -{2+(6+4menos2)+(5-(-7-6)-9]+6}=
- {2+(6+4menos2)+(5-(-7-6)-9]+6}
2+8+