- (a+b+c) = -a-b-c
- (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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- (a+b+c) = -a-b-c
- (a-b-c) = -a+b+c
+(-a-b+c) = -a-b+c
-(-a+b-c) = a-b+c
-(-a-(-b)+c) = a-b-c