SOLUTION: Expand -(a+b)

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This is a simple case:
-(a+b) is the same as -1*(a+b), just that we omit the one beacuse it is a mathematical notation.
Now we use the distributive property:
-1*a+(-1)*b
it becomes:
-a-b
-(a+b)=-a-b
example:
8*(2+3)=8*(2)+8*(3) DISTRIBUTIBE PROPERTY