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Why are the equations w - x + x = w and w + x - x = w called identities?

Why are the equations w - x + x = w and w + x - x = w called identities?
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Why are the equations w - x + x = w and w + x - x = w called identities?

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User Mukesh M
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2 Answers

4 votes
Identities have the same solution, and they are also called 'infinities'. That is because they include many solutions. 
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User John Li
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6 votes
They are indentical because the only thing that switched was the addition sign, and subtraction sign. If you look closely.

answered
User Michael Field
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