\left\{ \begin{array} { l } { y = a + b + c } \\ { 1 = 4 a + 2 b + c } \\ { - 2 = 9 a + 3 b + c } \end{array} \right.
Solve for y, a, b, c
y=\frac{c+5}{3}
a=\frac{c-7}{6}
b=\frac{17-5c}{6}
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