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0 is just plain 0. it's not a postitive or a negative.
This tells you that both factors are likely to have minus signs.
That means that both of your brackets will have minus signs.
That means that both of your brackets will have minus signs.
(x - 4) + (2x - 7) = 3x - 11 You get that by: Adding the x terms (one plus two) to get 3x; and adding the plain (non-x) numbers together. In this can both plain numbers are negative, so you get a negative of eleven, which is the sum of the absolute values 4 and 7.