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equation
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A mathematical statement that represents the equality of two expressions involving either constants, variable(s), or both. For example, 1 + 2 = 3 is an equation. So is xy =1.
If an equation is true for all possible value(s) of the variable(s), it is called an identity and denoted by  . For example, (a+b)(a-b) a2 - b2 is an identity.
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