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x can represent anything. it depends on the equation. in maths you generally must find the value of x. eg: 8 + x = 15. In this case you must figure out what number added to 8 equals 15. Because the opposite to addition is subtraction, to find x you would do x = 15 - 8. Therefore x = 7. So x has no given value, it all depends on the equation. Hope that helped :)
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