`1.`
`|2x - 3,5| = 6,5`
`=>` \(\left[ \begin{array}{l}2x - 3,5 = 6,5\\x - 3,5 = -6,5\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=5\\x=-3\end{array} \right.\)
`2.`
`|3x - 4/5| - 1/2 = 0`
`=> |3x - 4/5| = 1/2`
`=>` \(\left[ \begin{array}{l}3x - \dfrac{4}{5} = \dfrac{1}{2}\\3x - \dfrac{4}{5}= \dfrac{-1}{2}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=\dfrac{13}{30}\\x=\dfrac{1}{10}\end{array} \right.\)
`3.`
`|3/8 - 1/4 × x| = 1/4`
`=>` \(\left[ \begin{array}{l}\dfrac{3}{8} - \dfrac{1}{4} × x = \dfrac{1}{4}\\\dfrac{3}{8} - \dfrac{1}{4} × x = \dfrac{-1}{4}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=\dfrac{1}{2}\\x=\dfrac{5}{2}\end{array} \right.\)
