$$2 k + 1 = 9 \quad ( k ) 3 q + 9 = 18$$
$q=\frac{2}{51}\approx 0.039215686$
$k = \frac{17}{2} = 8\frac{1}{2} = 8.5$
$k = \frac{17}{2} = 8\frac{1}{2} = 8.5$
$q = \frac{2}{51} = 0.0392156862745098$
