\left\{ \begin{array} { l } { 7 a + 9 b = 64 } \\ { 9 a + 7 y = 64 } \end{array} \right.
Solve for a, b, y
y\in \mathrm{R}
a=\frac{64-7y}{9}
b=\frac{49y+128}{81}
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