\left\{ \begin{array} { l } { - 7 b + D = 0 } \\ { 2 A - B + C + D = 0 } \\ { 2 A + 2 B + 2 C + D = 0 } \end{array} \right.
Solve for b, D, A, B, C (complex solution)
b=\frac{4B-2A}{7}
D=4B-2A
A\in \mathrm{C}
B\in \mathrm{C}
C=-3B
Solve for b, D, A, B, C
b=\frac{4B-2A}{7}
D=4B-2A
A\in \mathrm{R}
B\in \mathrm{R}
C=-3B
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