Solve for X, β, f, n
X=0\text{, }\beta =0\text{, }f\in \mathrm{R}\text{, }n=0
X=fn\text{, }\beta \leq \frac{1}{4}\text{, }f=-\frac{\sqrt{1-4\beta }+1}{2n}\text{, }n\neq 0
X=fn\text{, }\beta \leq \frac{1}{4}\text{, }f=\frac{\sqrt{1-4\beta }-1}{2n}\text{, }n\neq 0
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