\left\{ \begin{array} { l } { x + y + z + 3 t = 1 } \\ { 3 x - y - z - 2 t = - 4 } \\ { 2 x + 3 y - z - t = - 6 } \\ { z + 2 y + 3 z - t = - 4 } \end{array} \right.
Solve for x, y, z, t
x = -\frac{93}{91} = -1\frac{2}{91} \approx -1.021978022
y = -\frac{187}{182} = -1\frac{5}{182} \approx -1.027472527
z=-\frac{3}{14}\approx -0.214285714
t = \frac{99}{91} = 1\frac{8}{91} \approx 1.087912088
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