\left. \begin{array} { | c | } \hline 7 + 2 a x = 13 \\ \hline 4 = \frac { 6 } { a } x + 5 \\ \hline \end{array} \right.
Solve for a, x (complex solution)
x=\frac{\sqrt{2}i}{2}\approx 0.707106781i\text{, }a=-3\sqrt{2}i\approx -0-4.242640687i
x=-\frac{\sqrt{2}i}{2}\approx -0-0.707106781i\text{, }a=3\sqrt{2}i\approx 4.242640687i
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