\left\{ \begin{array} { l } { b _ { 3 } + b _ { 5 } = 81 } \\ { b _ { 3 } + 2 b _ { 4 } + b _ { 5 } = 162 } \end{array} \right.
Solve for b_3, b_5, b_4 (complex solution)
b_{3}=81-b_{5}
b_{5}\in \mathrm{C}
b_{4} = \frac{81}{2} = 40\frac{1}{2} = 40.5
Solve for b_3, b_5, b_4
b_{3}=81-b_{5}
b_{5}\in \mathrm{R}
b_{4} = \frac{81}{2} = 40\frac{1}{2} = 40.5
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