The correct answer to this question is X=-5, 7. One would likely find this question on a math test. In particular, it would be found in tests for the math subject Algebra. Due to its difficulty, it could also be found on an IQ test, which is a test used to test one's intellect.
It includes many subjects along with math, as well as topics like entertainment and politics. The X's in this question represents a variable. Variables are used to represent a number. The number can be found by solving the equation, and the solution will replace the variables.
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