Решите неравенство \[|1+3x|\geqslant2.\] \[(-\infty;0]; [\frac{2}{3}; +\infty)\] \[(-\infty;-1]; [\frac{1}{3}; +\infty)\] \[[-1; \frac{1}{3}]\] \[[-1; \frac{2}{3}]\]

Задание

Решите неравенство

\[|1+3x|\geqslant2.\]

\[(-\infty;0]; [\frac{2}{3}; +\infty)\]
\[(-\infty;-1]; [\frac{1}{3}; +\infty)\]
\[[-1; \frac{1}{3}]\]
\[[-1; \frac{2}{3}]\]