\left\{ \begin{array} { l } { 2 n - 1 = b } \\ { - a + 5 = b } \end{array} \right.
Solve for n, b, a (complex solution)
n=-\frac{a}{2}+3
b=5-a
a\in \mathrm{C}
Solve for n, b, a
n=-\frac{a}{2}+3
b=5-a
a\in \mathrm{R}
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