` a,`
`|x - 1,7| = 2,3`
`⇔` \(\left[ \begin{array}{l}x -1,7 = 2,3\\x- 1,7 = -2,3\end{array} \right.\)
`⇔` \(\left[ \begin{array}{l}x=4\\x=-0,6\end{array} \right.\)
` b, `
`| x + 3/4 | -1/3 = 0`
`⇔ |x +3/4| =0 + 1/3`
`⇔ |x + 3/4| = 1/3`
`⇔` \(\left[ \begin{array}{l}x+\frac{3}{4} = \frac{1}{3} \\x + \frac{3}{4} =\frac{-1}{3}\end{array} \right.\)
`⇔` \(\left[ \begin{array}{l}x=\frac{1}{12}\\x=\frac{-7}{12}\end{array} \right.\)
