$$c=\frac{2}{0,6}+\frac{7}{6}$$
$c=4,5$
$$c=\frac{20}{6}+\frac{7}{6}$$
$$c=\frac{10}{3}+\frac{7}{6}$$
$$c=\frac{20+7}{6}$$
$$c=\frac{27}{6}$$
$$c=\frac{9}{2}$$
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$c≔4,5$