\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 = \frac{4}{3} = 1\frac{1}{3} \approx 1.333333333
b=-\frac{1}{3}\approx -0.333333333
c=-\frac{2}{3}\approx -0.666666667
d = \frac{5}{3} = 1\frac{2}{3} \approx 1.666666667
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