\left\{ \begin{array} { l } { - 7 B + D = 6 } \\ { 2 A - B + C + D = 0 } \\ { 2 A + 2 B + 2 C + D = 0 } \end{array} \right.
Solve for B, D, A, C
B=-\frac{C}{3}
D=-\frac{7C}{3}+6
A=\frac{C}{2}-3
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