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It means that there is an unknown, a variable whose value isn't initially know or stated, and that you have to figure out what is the correct value.

For example, in an equation such as

2x + 3 = 11

The question "find the value of x" is equivalent to "What number do you have to replace, for variable x, so that the equality is true?" In this case, the answer is 4, because 2 times 4, plus 3, is equal to 11; for any other value, the statement of equality would be false.

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15y ago

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