\left\{ \begin{array} { l } { 2 A - 3 C + D = 0 } \\ { 3 A - 2 C + D = 0 } \\ { 3 A - B + D = 0 } \end{array} \right.
Solve for A, C, D, B
A=-\frac{B}{2}
C=\frac{B}{2}
D=\frac{5B}{2}
B\in \mathrm{R}
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