`x-10=-90`
`→x=-90+10`
`→x=-80`
Vậy `x=-80`
`2x-100=-60`
`→2x=-60+100`
`→2x=40`
`→x=20`
Vậy `x=20`
`|x-100|=1000`
`→` \(\left[ \begin{array}{l}x-100=1000\\x-100=-1000\end{array} \right.\)
`→` \(\left[ \begin{array}{l}x=1100\\x=-900\end{array} \right.\)
Vậy `x∈{1100;-900}`
`|x-1|+4=13`
`→|x-1|=9`
`→` \(\left[ \begin{array}{l}x-1=9\\x-1=-9\end{array} \right.\)
`→` \(\left[ \begin{array}{l}x=10\\x=-8\end{array} \right.\)
Vậy `x∈{10;-8}`
