$$\left. \begin{array} { l } { \quad 3.1 \quad k - 11 = 2 } \end{array} \right.$$
$k = \frac{130}{31} = 4\frac{6}{31} \approx 4.193548387$
$$3.1k=2+11$$
$$3.1k=13$$
$$k=\frac{13}{3.1}$$
$$k=\frac{130}{31}$$
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