Đáp án:
Giải thích các bước giải:
`|3/4 + x | = 5/3 . 10/30`
`| 3/4+x|=5/9`
`=>` \(\left[ \begin{array}{l} \frac{3}{4}+x=\frac{5}{9} \\\frac{3}{4}+x=\frac{-5}{9}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=\frac{5}{9}-\frac{3}{4}\\x=\frac{-5}{9}-\frac{3}{4}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=\frac{-7}{36}\\x=\frac{-47}{36}\end{array} \right.\)
Vậy `x={` $\frac{-7}{36}$ `;` $\frac{-47}{36}$ `}` nên `x∉N`
