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Mathematics 21 Online
OpenStudy (anonymous):

How can you prove that b - a is the negative of a - b?

terenzreignz (terenzreignz):

Add them.

terenzreignz (terenzreignz):

No, seriously, add them :D If x and y are numbers such that x + y = 0 then y must be the negative of x (and vice versa)

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