\left\{ \begin{array} { l } { - 2 a - 2 b - c - d = - 3 } \\ { 2 d - c + 4 b - 2 a = 0 } \\ { d + c - b - a = 0 } \\ { - a + 2 b + c - 2 d = 6 } \end{array} \right.
Solve for a, b, c, d
a=0
b=1
c=2
d=-1
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