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An equation consists of two expressions joined by an '=' sign. If there is only one variable, you can usually solve the equation (find the value of the variable that makes the equation true).

Example: 3x + 5 = 11: the solution is 2. (The techniques for finding the solution are a major part of algebra.)

Check that 3(2) +5 = 6+5 = 11.

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Q: What are equations in algebra?
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