\left\{ \begin{array} { l } { a _ { 4 } = ( a _ { n } \times 2 ) } \\ { a = 1 } \end{array} \right.
Solve for a_4, a_n, a (complex solution)
a_{4}=2a_{n}
a_{n}\in \mathrm{C}
a=1
Solve for a_4, a_n, a
a_{4}=2a_{n}
a_{n}\in \mathrm{R}
a=1
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