\left\{ \begin{array} { l } { a - b + c = \varphi } \\ { a + b + c = 8 } \\ { 4 a + 2 b + c = 25 } \end{array} \right.
Solve for a, b, c, φ
a=\frac{\phi }{6}+\frac{13}{3}
b=-\frac{\phi }{2}+4
c=\frac{\phi -1}{3}
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