\(\left(2x+1\right)^3=-0,001\)
\(\Rightarrow\left(2x+1\right)^3=\left(-0,1\right)^3\)
\(\Rightarrow2x+1=-0,1\)
\(\Rightarrow2x=-\frac{1}{10}-1\)
\(\Rightarrow2x=-\frac{11}{10}\)
\(\Rightarrow x=-\frac{11}{10}:2\)
\(\Rightarrow x=-\frac{11}{10}.\frac{1}{2}=-\frac{11}{20}\)