`2 2/3 - | -7/9 - 3x| = -1/5`
`8/3 - |-7/9 - 3x| = -1/5`
`|-7/9 - 3x| = 8/3 - (-1/5)`
`|-7/9 - 3x| = 43/15`
⇒ `-7/9 - 3x = 43/15` hoặc `-7/9 - 3x = -43/15`
`3x = -7/9 - 43/15` hoặc `3x = -7/9 - (-43/15 )`
`3x = -164/45` hoặc `3x = 94/45`
`x = -164/45 : 3` hoặc `x = 94/45 : 3`
`x = -164/135` hoặc `x = 94/135`
Vậy `x ∈ { -164/135 ; 94/135}`
$\\$
`1/2 x + x - 2 = 10%`
`( 1/2 + 1) x = 1/10 + 2`
`3/2 x = 21/10`
`x = 21/10 : 3/2`
`x = 7/5`
Vậy `x = 7/5`
