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"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.
You don't use unknown variables to solve an equation. The purpose of solving an equation is to find the value of the variable so that it's no longer unknown.
Such an equation is called an IDENTITY.
No, it is part of the solution set.
X is an unknown quantity. You would need the rest of the equation to figure out the value of X.