`|7/5x + 1/2| = |4/3x - 1/4|`
`=> 7/5x + 1/2 = 4/3x - 1/4`
`=>` \(\left[ \begin{array}{l}\dfrac{7}{5}x + \dfrac{1}{2} = \dfrac{4}{3}x - \dfrac{1}{4} \\\dfrac{7}{5}x + \dfrac{1}{2} = -\dfrac{4}{3}x + \dfrac{1}{4}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l} \dfrac{7}{5}x - \dfrac{4}{3}x = \dfrac{-1}{2} - \dfrac{1}{4}\\\dfrac{7}{5}x + \dfrac{4}{3}x = -\dfrac{-1}{2} + \dfrac{1}{4}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}\dfrac{1}{15}x = \dfrac{-3}{4}\\\dfrac{41}{15}x = \dfrac{-1}{4}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x = \dfrac{-45}{4}\\ x = \dfrac{-15}{164}\end{array} \right.\)
``
``
`b)`
`|7/8x + 5/6| - |1/2x + 5| = 0`
`=> 7/8x + 5/6 = 1/2x + 5`
`=>` \(\left[ \begin{array}{l} \dfrac{7}{8}x + \dfrac{5}{6} = \dfrac{1}{2}x + 5 \\ \dfrac{7}{8}x + \dfrac{5}{6} = -\dfrac{1}{2}x + 5\end{array} \right.\)
`=>` \(\left[ \begin{array}{l} \dfrac{7}{8}x - \dfrac{1}{2} = -\dfrac{5}{6} + 5 \\ \dfrac{7}{8}x + \dfrac{1}{2} = -\dfrac{5}{6} - 5\end{array} \right.\)
`=>` \(\left[ \begin{array}{l} \dfrac{3}{8}x = \dfrac{25}{6} \\ \dfrac{11}{8}x = \dfrac{-35}{6}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x = \dfrac{100}{9}\\x = \dfrac{-140}{33}\end{array} \right.\)
