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It is the opposite of Expanding The Brackets
9 - 4 = 9 + (-4)
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Yes, -4x2 is a valid mathematical statement.
The differences of the expressions (a - b) and (b - a) are related by the fact that (b - a) is the negative of (a - b). This means that if (a - b) is positive, then (b - a) will be negative, and vice versa. Specifically, we can express this relationship mathematically as (b - a = -(a - b)). Thus, the two expressions have equal magnitude but opposite signs.