\left\{ \begin{array} { l } { 2 d + 2 e + f = 11 } \\ { a + e + 3 f = 13 } \end{array} \right.
Solve for d, f, a
d=\frac{a}{6}-\frac{5e}{6}+\frac{10}{3}
f=\frac{-a+13-e}{3}
a\in \mathrm{R}
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