\left\{ \begin{array} { l } { 6 a + 4 r = 5 } \\ { 9 a - 8 v = 4 } \end{array} \right.
Solve for a, r, v
r=-\frac{4v}{3}+\frac{7}{12}
a=\frac{8v+4}{9}
v\in \mathrm{R}
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