`1)`
`|9-7x| =5x-3`
`=>9-7x =5x-3` hoặc `9-7x =-5x+3`
`=>-7x-5x=-9-3` hoặc `-7x+5x=-9+3`
`=>-12x=-12` hoặc `-2x=-6`
`=>x=1` hoặc `x=3`
Vậy `x=1;x=3`
`2)`
`|17x -5| - | 17x +5 | =0`
`=>|17x -5|=| 17x +5 |`
`=>`\(\left[ \begin{array}{l}17x-5=17+5\\17x-5=-(17x+5)\end{array} \right.\)
TH1:
`17x-5=17x+5`
`=>17x-17x=5+5`
`=>0x=10` (vô lí)
TH2:
`17x-5=-17x-5`
`=>17x+17x=5-5`
`=>34x=0`
`=>x=0`
Vậy `x=0`