`|-1/10|-(1/3)^2:5/9`
`= 1/10 - 1/9 : 5/9`
`= 1/10 - 1/9 . 9/5`
`=1/10 - 1/5`
`=1/10 -2/10`
`= \frac{-1}{10}`
`- - -- - - -- - - - - - `
`2-|x+2/3|=1/4`
`⇔|x + 2/3 |= 2 - 1/4`
`⇔|x+ 2/3| = 7/4`
`⇔ ` \(\left[ \begin{array}{l}x +\frac{2}{3} =\frac{7}{4}\\x + \frac{2}{3}=\frac{-7}{4} \end{array} \right.\)
`⇒` \(\left[ \begin{array}{l}x=\frac{13}{12}\\x=\frac{-29}{12}\end{array} \right.\)
