\left\{ \begin{array} { l } { a + b + c + x = 10 } \\ { b + 2 a + 3 c + 45 = 8 } \\ { c + 5 a + 6 b + x = 7 } \\ { 7 c + 8 a + 3 b + 6 x = 8 } \end{array} \right.
Solve for a, b, c, x
x = \frac{413}{20} = 20\frac{13}{20} = 20.65
a = -\frac{125}{12} = -10\frac{5}{12} \approx -10.416666667
b = \frac{116}{15} = 7\frac{11}{15} \approx 7.733333333
c = -\frac{239}{30} = -7\frac{29}{30} \approx -7.966666667
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