Řeš v \( \mathbb{R} \) rovnici:
\( |x|+|6 x+1|=3 \)
\( K=\left\{-\frac{4}{7} ; \frac{2}{7}\right\} \)
\( K=\left\{-\frac{3}{7} ; \frac{2}{7}\right\} \)
\( K=\left\{-\frac{5}{7} ; \frac{2}{7}\right\} \)
\( K=\left\{-\frac{4}{7} ; \frac{3}{7}\right\} \)
