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Why is x in math when math is for numbers?

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X is an abstract that should be known in any problem of maths equation. So the unknown that dictates the whole equation is represented as " x" and x some times shall have more than one value or a range of values You can use any othe letter but this cross shape represents not known.
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X is an abstract  that should be known in any problem of maths equation.

 

So the unknown that dictates the whole equation is represented as

" x" and x some times shall have more than one value or a range of values  

You can use any othe letter but this cross shape represents not known.

read less
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