a)
\(\left(x-\dfrac{3}{5}\right):\dfrac{-1}{3}=0,4\)
\(\left(x-\dfrac{3}{5}\right):\dfrac{-1}{3}=\dfrac{2}{5}\)
\(x-\dfrac{3}{5}=\dfrac{2}{5}.\dfrac{-1}{3}\)
\(x-\dfrac{3}{5}=\dfrac{-2}{15}\)
\(x=\dfrac{-2}{15}+\dfrac{3}{5}\)
\(x=\dfrac{-2}{15}+\dfrac{9}{15}\)
\(x=\dfrac{7}{15}\)
b)
\(\left|x-1\right|=4\)
\(\Rightarrow\left[{}\begin{matrix}x-1=4\\x-1=-4\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=4+1\\x=-4+1\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=5\\x=-3\end{matrix}\right.\)
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