+ (a + b + c)= a + b + c;
+ (-a + b + c) = -a + b + c;
- (a - b - c) = -a + b + c;
- (-a + b + c) = a - b - c;
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Answers & Comments
+ (a + b + c)= a + b + c;
+ (-a + b + c) = -a + b + c;
- (a - b - c) = -a + b + c;
- (-a + b + c) = a - b - c;