Đáp án:
`a)` \(\left[ \begin{array}{l}x=\frac{2}{7}\\x=\frac{-12}{7}\end{array} \right.\)
`b) x=-28`
Giải thích các bước giải:
`a) |x+5/7|=1`
`<=>`\(\left[ \begin{array}{l}x+\frac{5}{7}=1\\x+\frac{5}{7}=-1\end{array} \right.\)
`<=>`\(\left[ \begin{array}{l}x=1-\frac{5}{7}\\x=-1-\frac{5}{7}\end{array} \right.\)
`<=>`\(\left[ \begin{array}{l}x=\frac{2}{7}\\x=\frac{-12}{7}\end{array} \right.\)
`b) -26/(x-11)=2/3`
`<=>x-11=-26:(2/3)`
`<=> x-11=-26.3/2`
`<=>x-11=-39`
`<=> x=-39+11`
`<=> x=-28`
