I honestly don't know, for it is unknown.
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They are used in place of an unknown number or value.
That will depend on the value of the unknown variable
The answer depends on the value of C, which is unknown.
It is no tpossible to find the square root of an unknown number. You can, however, represent it as x0.5 or √x so that the value of the square root can be evaluated when the value of x is known.
"430 5" is not an equation and it does not have an unknown value. So there can be no equation which has the same unknown value.